One litre milk costs 40 per litre. Water is mixed with milk and the mixture was sold at 30 per litre. Find the ratio of water and milk in the mixture.(if there is no profit or loss)

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:

What sum (in ₹) will earn a simple interest of ₹840 in 3 years at 20% per year rate of interest?