The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is

In a group of 35 people, 23 of them like coffee, 24 of them like tea and each person likes at least one of the drinks. How many like both? 

The sum of the two - digit number is 6 and the number and its flip (digits written in reverse order) both are multiples of 3. If the difference between them is 36, then which of the following is the required number and its flip? 

A number when divided by 899 gives a remainder 63. If the same number is divided by 29, the remainder will be

The product of 1.7 ´ 10⁴ and 12.5 ´ 10^–6 is expressed in the standard form as k ´ 10ⁿ . The value of (2k + n) is

What is the average of the first 13 odd numbers?

The 4th term of an arithmetic progression is 15, 15th term is -29, find the 10th term?

If the 8-digit number 888x53y4 is divisible by 72, then what is the value of (7x + 2y) for the maximum value of y?