Answer the following questions by selecting the correct/most appropriate option.

What is the missing number in the pattern given below?
1, 6, 15, ____________, 45, 66, 91

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.

If the price of rice increases by 20% and a person reduces its consumption by 20%, by what percentage will his total expenditure on rice decrease?

If the mean proportional of A and 27 is 18, then find the value of A.

If 30% of a number exceeds 20% of it by 24, then the number is:

The number of prime numbers lying between 300 and 305 is:

A person walks at a speed of 3 km/hr and reaches a destination in 7 hours. If the person increases the speed by 1 km/hr, how much earlier will they reach the destination

A person walks at a speed of 2 km/hr and reaches a destination in 4 hours. If the person increases the speed by 3 km/hr, how much earlier will they reach the destination?

Nine identical cubes, each with edge 3 cm, are joined in a straight line to form a cuboid. What is the total surface area (in cm²) of the resulting cuboid?

The LCM of the numbers 3.7 and 0.068 is:

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.