A bowler throws a cricket ball at a speed of 120 km/h. How long does this ball take to travel a distance of 20 metres to reach the batsman?

A recipe for a particular type of muffins required 1 cup of milk and 1.5 cups of chocolates. Riya has 7.5 cups of chocolates. If she is using the recipe as a guide, how many cups of milk will she need to prepare muffins?

Pattern B consists of four tiles like pattern A. Write a proportion involving red dots and blue dots in pattern A and B. Are they in direct proportion? If yes, write the constant of proportion.

The variable x is inversely proportional to y. If x increases by p%, then by what percent will y decrease?

Here is a key board of a harmonium:

(a) Find the ratio of white keys to black keys on the keyboard.

(b) What is the ratio of black keys to all keys on the given keyboard.

(c) This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.