If (x+3y)=15 and x=-1.5y, then x=?

১

Successive discounts of 20% and 15% are equal to a single discount of ---

30%

32%

34%

35%

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

32%

২

The element in the position marked by in the series B, D, F,......, 11,___ is

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

এখানে B + 2 = D, D + 2 = F,তাই 11 + 2 = 13.

৩

If 1/5-1/3=x/30, the value of x?

-4

-5

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

-4

সমাধান

x/30 = 1/5 - 1/3 or, x/30 = (3 - 5)/15 or, x/30 = - 2/15 or, x = ( - 2)*30/15 or, x = - 4

৪

The share price of a bank decreased by 5% on the 15th of November, but increased by 10% of the next day. What was the overall rate of loss or gain?

2.5%

5% gain

2.5% gain

4.58% gain

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

4.58% gain

সমাধান

Let the initial share price be S. Decreased share price = S - 5% of S = 0.95S Increased share price = 0.95S + 10% of 0.95S = 1.045S So, gain percentage = (1.045S - S) / S x 100% = 4.5%

৫

Given AB = 4, AC = 5, the perimeter of the rectangle is -

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

AB2 + BC2 = AC2 or, BC2 = AC2 - AB2 or, BC = √(AC2 - AB2) or, BC = √(52 - 42) = 3 So, perimeter of the rectangle = 2(AB + BC) = 2(4 + 3) = 14

৬

Sumi walks to her office at the rate of 4 miles per hour. If she increases her walking speed by 1 mile per hour , she would reach her office half an hour earlier than the previous time. What is the distance in miles of her office from her house?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Let the distance and time be d mile and T hours respectively. So, d = 4T. Again, d = (4 + 1) (T - 1/2) or, 4T = 5(T - 1/2) or, 4T = 5T - 5/2 or, 5T - 4T = 5/2 or, T = 5/2 hours So, d = 4T = 4 x 5/2 = 10 mile.

৭

If your body mass on the surface of the earth is 42 kg, what would be your body mass on the surface of the moon?

42 Newton

42 kg

7 Newton

7 kg

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

42 kg

সমাধান

Mass of object is independent of gravity. Therefore, it will be the same everywhere.

৮

X purchased some pens for TK. 120. If the price per piece of pen was TK. 3 less, he would have received 2 more pens. How many pens did he purchase?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Let the number of pens be N. Then, price of each pen = 120/N He would get (N + 2) pens if the price of each pen was [120/N - 3]. So, 120 / (N + 2) = (120/N) - 3 or, 120 / (N + 2) = (120 - 3N) / N or, 120N = (120 - 3N) (N + 2) or, 120N = 120N + 120 x 2 - 3N2 - 3N x 2 or, 3N2 + 6N + 120N - 120N - 240 = 0 or, 3N2 + 6N - 240 = 0 or, N2 + 2N - 80 = 0 or, N2 + 10N - 8N - 80 = 0 or, N(N + 10) - 8(N + 10) = 0 or, (N + 10) (N - 8) = 0 or, N - 8 = 0 [N + 10 = / 0] So, N = 8

৯

The average age of three persons is 30 years. If the ratio of three ages is 3: 5: 7, what is the age of the youngest person?

18 years

8 years

16 years

42 years

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

18 years

সমাধান

Total age of them = 30 x 3 = 90 years. Sum of the ratios = 3 + 5 + 7 = 15 So, the age of the youngest person = 3 / 15 x 90 = 18 years

১০

If x =2y +3 and y= -2 , then

x =-2

x is greater than -1

x =-1

x is less than -1

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

x =-1

সমাধান

Here, x = 2y + 3 or, x = 2 ( - 2) + 3 [y = - 2] or, x = - 4 + 3 So, x = - 1

অনুসন্ধান করুন

বিস্তারিত সমাধান

If (x+3y)=15 and x=-1.5y, then x=?

Successive discounts of 20% and 15% are equal to a single discount of ---

The element in the position marked by in the series B, D, F,......, 11,___ is

If 1/5-1/3=x/30, the value of x?

The share price of a bank decreased by 5% on the 15th of November, but increased by 10% of the next day. What was the overall rate of loss or gain?

Given AB = 4, AC = 5, the perimeter of the rectangle is -

Sumi walks to her office at the rate of 4 miles per hour. If she increases her walking speed by 1 mile per hour , she would reach her office half an hour earlier than the previous time. What is the distance in miles of her office from her house?

If your body mass on the surface of the earth is 42 kg, what would be your body mass on the surface of the moon?

X purchased some pens for TK. 120. If the price per piece of pen was TK. 3 less, he would have received 2 more pens. How many pens did he purchase?

The average age of three persons is 30 years. If the ratio of three ages is 3: 5: 7, what is the age of the youngest person?

If x =2y +3 and y= -2 , then

কোর্স

অনুসন্ধান করুন

বিস্তারিত সমাধান

If (x+3y)=15 and x=-1.5y, then x=?

সম্পর্কিত বিষয় সমূহ

সম্পর্কিত অন্যান্য প্রশ্ন

Successive discounts of 20% and 15% are equal to a single discount of ---

The element in the position marked by __ in the series B, D, F,......, 11,_____ is

If 1/5-1/3=x/30, the value of x?

The share price of a bank decreased by 5% on the 15th of November, but increased by 10% of the next day. What was the overall rate of loss or gain?

Given AB = 4, AC = 5, the perimeter of the rectangle is -

Sumi walks to her office at the rate of 4 miles per hour. If she increases her walking speed by 1 mile per hour , she would reach her office half an hour earlier than the previous time. What is the distance in miles of her office from her house?

If your body mass on the surface of the earth is 42 kg, what would be your body mass on the surface of the moon?

X purchased some pens for TK. 120. If the price per piece of pen was TK. 3 less, he would have received 2 more pens. How many pens did he purchase?

The average age of three persons is 30 years. If the ratio of three ages is 3: 5: 7, what is the age of the youngest person?

If x =2y +3 and y= -2 , then

The element in the position marked by in the series B, D, F,......, 11,___ is