Find the least number exactly divisible by 12,15,20,27 ?

Find the sum of all prime numbers between 10 and 90.

In a division sum, the divisor is 3 times the quotient and 6 times the remainder. If the remainder is 2, then the dividend is: 

Direction : What should come in place of the question (?) in the following question.

$${34×4-12×8\over \ {6^2}+{\sqrt{196}}+(11)^2}=?$$

If a and b are odd numbers, then which of the following is even?

The number of integers in between 100 and 600, which are divisible by 4 and 6 both, is: 

For what value of m will the system of equations 17x+my+102=0 and 23x+299y+138=0 have infinite number of solutions? 

A man engaged a servant on the condition that he would pay him Rs. 90 and a turban after service of one year. he served only for nine months and received the turban and an amount of Rs. 65. The price of turban is: