Convert the following ratios to percentages.
(a) 3 : 4 (b) 2 : 3

Find the ratio of the following:

(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.

(b) 5 m to 10 km

(c) 50 paise to Rs 5

A football team won 10 matches out of the total number of matches they played. If their win percentage was 40, then how many matches did they play in all?

72% of 25 students are good in Mathematics. How many are not good in Mathematics?

If Chameli had Rs 600 left after spending 75% of her money, how much did she have in the beginning?