What mathematical operation should come at the place of '?' in the equation : 2 ? 6 - 12 ÷ 4 + 2 = 11

The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbe...

Two numbers are such that the ratio between them is 4:7 . If each is increased by 4, the ratio becomes 3:5 . T...

A person's present age is two-fifth of the age of his mother. After 8 years , he will be one-half of the age o...

If 25% of a number is subtracted from a second number, the second number reduces to its five-sixth .What is th...

The ages of A and B are in the ratio 3:1 . Fifteen years hence , the ratio will be 2:1 . Their present ages ar...

Aunik, Kamal and Jamal invested TK. 8000, TK. 4000 and TK. 8000 respectively in a business . Aunik left after...