If x and y are prime numbers, which of the following cannot be the sum of x and y?

১

If 10% of r is 20% of s. is 20% of s is 30% of t and 100% of r is x% of t, then x is ----

300

33.33

66.66

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

300

সমাধান

Here 0.1 × r = 0.2 × s = 0.3 × t r = 0.01 × x × t3 × t =0.01 × x × tSo, x = 300 (ans.)

২

A container full of water weighs 18.5 kg. If one -fourth of the container is full of water , it weighs 6.5 kg. What is the weight of the empty container?

2.5 kg

3 kg

2 kg

2.3 kg

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

2.5 kg

সমাধান

Weight of container + weight of totally filled water = 18.5 kg Weight of container + weight of 1/4 th filled water = 6.5 kg - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - [Subtraction] Weight of the 3/4th [1 - 1/4 = 3/4] filled water = 18.5 - 6.5 = 12 kg So, weight of fully filled water = 12 x 4 / 3 = 16 kg Therefore, weight of the container = 18.5 - 16 = 2.5 kg

৩

If r=18 and r/s = 6/y, then y/s is ----

1/3

1/6

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

1/3

সমাধান

Here, r/s = 6/y or, y/s = 6/r So, y/s = 6/18 = 1/3 [r = 18]

৪

Mr. Jamal employed 50 workers to finish a work within 30 days. After 20 days he found out that only 50% work had been completed. How many additional workers did Mr. Jamal need to finish the work in time?

100

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Remaining days = 30 - 20 = 10 days Remaining work = 100% - 50% = 50% Now, 50% work can be completed in 20 days by 50 workers So, 50% work can be completed in 10 days by 50 x 20 / 10 = 100 workers Therefore, additional workers needed = 100 - 50 = 50

৫

A retailer buys a Panjabi and a Fatua jointly at Tk. 500. If he sells the Fatua at 10% profit and the panjabi at 5% loss , then he gets, Tk. 520 as total sales price. What is the cost price of the Fatua?

Tk. 150

Tk. 200

Tk. 280

Tk. 300

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

Tk. 300

সমাধান

Let the cost price of the Fatua and the Panjabi be F and (500 - F) respectively. Now, total sales price, F + 10% of F + (500 - F) - 5% of (500 - F) = 520 or, F + 10/100 F + 500 - F - 5/100 of 500 + 5/100 of F = 520 or, F/10 + F/20 = 520 + 25 - 500 or, 3F/20 = 45 or, F = 45 x 20 / 3 = 300 TK

৬

If p number of pencils cost c paisa, how many pencils can be bought for taka?

100 pd/c

100 cd/p

10 cp/d

100 d/cp

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

100 pd/c

৭

In an examination of four subjects, a student got 70,80, 90 and x marks and his average was 75. What was the value of x?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Here, 70 + 80 + 90 + x = 4 x 75 or, x = 300 - 240 So, x = 60

৮

If the product of 4 consecutive integers is equal to one of them , then what is the largest possible value of one of the integers?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

let,4 consecutive numbers are 0,1,2,3 Now lets take the product of them: 0 * 1 * 2 * 3 = 0 As we can see, it's equal to one of the integers which is 0 So that meets the requirement. From those set of numbers, 3 is the largest. (ans)

৯

Three times a number minus 7 is 32. What is the twice of the number?

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

সমাধান

Let the number be N. According to the question, 3N - 7 = 32 or, 3N = 32 + 7 = 39 So, N = 39/3 = 13 Therefore, twice of N or 2N = 2 x 13 = 26.

১০

If x% of y is 10, then what is y?

10/x

100/x

1000/x

x/100

উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।

বিস্তারিত

উত্তর

1000/x

সমাধান

ATQ, x% of y = 10 or, xy/100 = 10 or, xy = 1000 or, y = 1000/x ans: 1000/x

অনুসন্ধান করুন

বিস্তারিত সমাধান

If x and y are prime numbers, which of the following cannot be the sum of x and y?

If 10% of r is 20% of s. is 20% of s is 30% of t and 100% of r is x% of t, then x is ----

A container full of water weighs 18.5 kg. If one -fourth of the container is full of water , it weighs 6.5 kg. What is the weight of the empty container?

If r=18 and r/s = 6/y, then y/s is ----

Mr. Jamal employed 50 workers to finish a work within 30 days. After 20 days he found out that only 50% work had been completed. How many additional workers did Mr. Jamal need to finish the work in time?

A retailer buys a Panjabi and a Fatua jointly at Tk. 500. If he sells the Fatua at 10% profit and the panjabi at 5% loss , then he gets, Tk. 520 as total sales price. What is the cost price of the Fatua?

If p number of pencils cost c paisa, how many pencils can be bought for taka?

In an examination of four subjects, a student got 70,80, 90 and x marks and his average was 75. What was the value of x?

If the product of 4 consecutive integers is equal to one of them , then what is the largest possible value of one of the integers?

Three times a number minus 7 is 32. What is the twice of the number?

If x% of y is 10, then what is y?

কোর্স

অনুসন্ধান করুন

বিস্তারিত সমাধান

If x and y are prime numbers, which of the following cannot be the sum of x and y?

সম্পর্কিত বিষয় সমূহ

সম্পর্কিত অন্যান্য প্রশ্ন

If 10% of r is 20% of s. is 20% of s is 30% of t and 100% of r is x% of t, then x is ----

A container full of water weighs 18.5 kg. If one -fourth of the container is full of water , it weighs 6.5 kg. What is the weight of the empty container?

If r=18 and r/s = 6/y, then y/s is ----

Mr. Jamal employed 50 workers to finish a work within 30 days. After 20 days he found out that only 50% work had been completed. How many additional workers did Mr. Jamal need to finish the work in time?

A retailer buys a Panjabi and a Fatua jointly at Tk. 500. If he sells the Fatua at 10% profit and the panjabi at 5% loss , then he gets, Tk. 520 as total sales price. What is the cost price of the Fatua?

If p number of pencils cost c paisa, how many pencils can be bought for taka?

In an examination of four subjects, a student got 70,80, 90 and x marks and his average was 75. What was the value of x?

If the product of 4 consecutive integers is equal to one of them , then what is the largest possible value of one of the integers?

Three times a number minus 7 is 32. What is the twice of the number?

If x% of y is 10, then what is y?