Estimate 20% of ₹ 357.30

Estimate 30% of Rs 375.50

Estimate 15% of ₹375.50

Half lives of two isotopes X and Y of a material are known to be 2xx10^(9) years and 4xx10^(9) years respectively. If a planet forms with equal number of these isotopes, estimate the current age of the planet, given that currently the material has 20% of X and 80% of Y by number

In a battery manufacturing factory, machines P, Q and R manufacture 20%, 30% and 50% respectively of the total output. The chances that a defective battery is produced by these machines are 1%, 1.5% and 2% respectively. If a battery is selected as random from production, then the probability that it is defective is

The formula of a metal chloride is MCl_3 and it contains 20% of the metal.The atomic weight of the metal is approxiamately

A ball is released from a height of 10 m. If it loses 20% of its energy on hitting the ground, the height to which it bounces is