On a road three consecutive traffic lights change after 36, 42 and 72 seconds respectively. If the lights are first swit…

The sum of the cubes of two numbers in the ratio 3 : 4 is 5824. The sum of the numbers is :

A number is doubled and 9 is added, If the resultant is tripled, it becomes 75. What is the number ?

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

The sum of two numbers is 684 and their HCF is 57. Find all possible pairs of such numbers.

The digit in unit's place of the product (2153)<sup>167</sup> is -

The last three-digits of the multiplication 12345 × 54321 will be

If the product of two positive numbers be 1575 and their ration is 7 : 9, then the greatest number is :