বিস্তারিত সমাধান

ন্যাভিগেশন মেনু

প্রশ্ন ও অপশন

সমাধান ও ব্যাখ্যা

সম্পর্কিত বিষয়

সম্পর্কিত প্রশ্ন

How much is the weight of 5 liter of water if 1 cc of it weighs 1gm?

0.5kg

1kg

25kg

5kg

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

ব্যাখ্যা ও সঠিক সমাধান

উত্তর: 5kg

5 liter = 5000cc = 5000g = 5kg

পূর্ববর্তী আগের প্রশ্ন

পরবর্তী সামনের প্রশ্ন

What should be added with 15480 to make it exactly divisible by 14?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Here, 15480 ÷ 14 = 1105; remainder = 10 Number to be added = 14 - 10 = 4

২

The average age of 40 employees in a branch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

55.5

50.5

20.5

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

55.5

সমাধান

Total age of 40 employees = 40×35 = 1400 years Total age of 41 employees = 41×35.5 = 1455.5 years Age of the new employee = 1455.5 - 1400 = 55.5 years

৩

Rumi and Rony can finish a task, working together, in 12 days. If Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Together the can finish 1/12 of the work in a day. Rony alone can finish 1/20 of the work in a day. Rumi alone can finish = 1/12 - 1/20 = (5 - 3)/60 = 1/30 of the work in a day. So, Rumi alone can finish the work in 30 days.

৪

Arif incurred a loss of 25% by selling a used mobile phone set at taka 1500. How much could he gain/lose by selling that 2200 taka?

10% loss

20% gain

10% gain

20% loss

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

10% gain

সমাধান

Let the original price be A. Then, A - 25% of A = 1500 or, A - 0.25A = 1500 or, 0.75A = 1500 or, A = 1500/0.75 = 2000 TK Gain = (2200 - 2000)/2000 × 100% = 10%

৫

Roman covers 17 kilometer in 5 hours. How much time does he need to cover 10.2 kilometer?

2.5 Hrs

3.4 Hrs

3.5 Hrs

3 Hrs

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

3 Hrs

সমাধান

He can cover 17 km in 5 hrs So, He can cover 10.2 km in 5×10.2/17 hrs = 3 hrs

৬

The ratio between the length and breadth of a field is 7:5. The perimeter of the field is 360 meter. What is the area of the field?

31000 sq. meter

31500 sq. meter

7875 sq. meter

8775 sq. meter

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

7875 sq. meter

সমাধান

Let the length and breadth be 7x and 5x meters respectively. Then, perimeter, 2(7x + 5x) = 360 or, 2×12x = 360 or, 24x = 360 or, x = 360/24 = 15 Area = length×breadth = 7x × 5x = 35x2 = 35×152 = 35×225 = 7875 m2

৭

Present age of Samad and Akmal are in the ratio of 5:4 respectively. Three years later, the ratio of their ages will become 11:9 respectively. What is Akmals present age?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Let their present ages be 5x and 4x respectively. Three years later, (5x + 3) : (4x + 3) = 11 : 9 or, (5x + 3) / (4x + 3) = 11/9 or, 9(5x + 3) = 11(4x + 3) or, 45x + 27 = 44x + 33 or, 45x - 44x = 33 - 27 or, x = 6 So, present age of Akmal = 4x = 4×6 = 24 years

৮

Three pipes P, Q and R can fill a tank in 6 hours. After working all three together for 2 hours, R is closed and P and Q can fill the remaining part in 7 hours. The number of hours taken by R alone to fill the tank is-

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

P, Q & R alltogether can fill 1/6 th of the tank in 1 hour So, in 2 hours they fill = 2×1/6 = 1/3 of the tank Remining part to be filled = 1 - 1/3 = 2/3 of the tank P & Q together in 7 hours can fill 2/3 of the tank So, P & Q together in hour can fill = 2/(3×7) = 2/21 of the tank So, R alone can fill in 1 hour = 1/6 - 2/21 = (7 - 4)/42 = 1/14 of the tank Therefore, R alone can fill the tank in 14 hours.

৯

A picture is copied onto a sheet of paper, which measures 8.5 inches by 10 inches. A border of 1.5 inch is left all around. What is the area, in square inches, covered by the picture?

38.5

59.5

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

38.5

সমাধান

Measurements excluding borders are (8.5 - 2×1.5 = 5.5) inches by (10 - 2×1.5 = 7) inches. So, area of the picture = 5.5×7 = 38.5 in2

১০

A man can row three- quarters of a kilometer against the stream in 11.25 minutes and down the stream in 7.5 minutes. The speed ( in km/hr) of the man in still water is-

4 km/hr

5 km/hr

6 km/hr

6.5 km/hr

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

5 km/hr

সমাধান

Let the speed of the man and flow of the stream U and V respectively. Distance = 3/4 km Time taken to go upstream = 11.25 min = 11.25/60 hr Conbined speed upstream = (3/4) / (11.25/60) = 4 km/hr or, U - V = 4 or, V = U - 4 Time taken to go downstream = 7.5 min = 7.5/60 hr Conbined speed downstream = (3/4) / (7.5/60) = 6 km/hr or, U + V = 6 or, U + U - 4 = 6 or, 2U = 6 + 4 or, U = 10/2 = 5 km/hr

প্রশ্ন সমাধান বিষয়

কোর্স

অনুসন্ধান করুন

বিস্তারিত সমাধান

How much is the weight of 5 liter of water if 1 cc of it weighs 1gm?

সম্পর্কিত বিষয় সমূহ

সম্পর্কিত অন্যান্য প্রশ্ন

What should be added with 15480 to make it exactly divisible by 14?

The average age of 40 employees in a branch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

Rumi and Rony can finish a task, working together, in 12 days. If Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone?

Arif incurred a loss of 25% by selling a used mobile phone set at taka 1500. How much could he gain/lose by selling that 2200 taka?

Roman covers 17 kilometer in 5 hours. How much time does he need to cover 10.2 kilometer?

The ratio between the length and breadth of a field is 7:5. The perimeter of the field is 360 meter. What is the area of the field?

Present age of Samad and Akmal are in the ratio of 5:4 respectively. Three years later, the ratio of their ages will become 11:9 respectively. What is Akmals present age?

Three pipes P, Q and R can fill a tank in 6 hours. After working all three together for 2 hours, R is closed and P and Q can fill the remaining part in 7 hours. The number of hours taken by R alone to fill the tank is-

A picture is copied onto a sheet of paper, which measures 8.5 inches by 10 inches. A border of 1.5 inch is left all around. What is the area, in square inches, covered by the picture?

A man can row three- quarters of a kilometer against the stream in 11.25 minutes and down the stream in 7.5 minutes. The speed ( in km/hr) of the man in still water is-