Number System, Problems on Number

Think of a number and then double the number. Add 6 and then multiply the number by 10. Now divide the number by 20, then subtract the number you first thought of. What is the result?

A rectangular block 6 cm by 12 cm by 15 cm is cut up into an exact number of equal cubes. Find the least possible number of cubes.

Of the following list of numbers, which has the greatest standard deviation?

The product of two different irrational numbers is always -

666 ÷ 6 ÷ 3 = ?

A collection of books went on sale and 2/3 of them was sold for Taka 2.30 each. If none of the 36 remaining books were sold, what was the total amount received for the books that were sold?

(1/2) × (3/4) × (8/4) ÷ (8/2) × (1/2) =?

The average of 7 consecutive numbers is 20. The largest of these number is -

If the sum of the 3 consecutive integers is 240, then the sum of the two larger integers is:

When the positive integer n is divided by 5, the remainder is 2. Which of the following must be true?

How many positive integers less than ten thousand are multiples of both eight and eighteen.

6 × 3 (3 - 1) is equal to =?

The average of 5 consecutive numbers is n. If the next two numbers are also included, the average will:

The number 3 divides 'a' with a result of 'b' and a reminder of 2. The number 3 divides 'b' with a result of 2 and 'a' reminder of 1. What is the value of 'a'?

If x is an integer and y = 7x + 5, which of the following CANNOT be a divisor of y?

Which number is odd one in oval A and B respectively?

A gardener has to plant trees in rows containing equal number of trees. If he plants in rows of 6, 8, 10 or 12 then five trees are left unplanted. But if he plants in rows of 13 trees each, then no tree is left. What is the number of trees that the gardener plants?

What value will come in place of question mark in the following equations 0.006 ÷ ? = 0.6

For all numbers x and y, x # y = xy + x. What is the value of 5 # 4?

The number of students in each section of a school is 24, After admitting new students, three new sections were started. Now, the total number of sections is 16 and there are 21 students in each section. The number of new students admitted is-