The simple interest on a principal amount (in ₹) is ₹378 for a period of 5 years at the rate of 9% per annum. The principal amount (in ₹) is:

Two successive discounts of 30% and 20% was offered on food items. A man paid ₹840 for the food item. The bill amount of food item (in ₹) is:

A train running at 75 km/hr crosses another train running at 30 km/hr in the same direction in 108 seconds. If the length of the fast-moving train is 950 m, then what is the length (in m) of the slow-moving train?

Evaluate: 16 + 10 ÷ 5-2×4

Two numbers are x and 4x, and their mean proportional is 456976. Find x.

The income of Raman is ₹75400. He saves 23% of his income. If his income increases by 27% and expenditure increases by 50%, then his savings will:

Find the surface area (in cm²) of a sphere whose diameter is 21 cm.