Which of the following is a rational one?

The number of primes between 59 and 101 is –––.

Three numbers are in the ratio 4 : 5 : 6 and the average is 25. The largest number is

When a number is divided by 8 the remainder is 6 and when the same number is divided by 7 the remainder is 5. What is the number ?

Which is the one that does not belong to the group

If + means x, x means -, ÷ means ÷ and - means + then 60 + 5 ÷ 15 – 20 x 15 = ?