Javed was given 5/7 of a basket of oranges. What fraction of orranges was left in the basket?

There are 4 oranges, 5 apples and 6 mangoes in a fruit basket. In how manyways can a person make a selection of fruits from among the fruits in the basket?

Kristin received a CD player for birthday. She bought 3 CDs and received 5 others as gifts. What fraction of her total CDs did she buy and what fraction did she receive as gifts?

There are 3 oranges, 5 apples and 6 mangoes in a fuit basket (all fruits of same kind are identical). Number of ways in which fruits can be selected from the basket, is

Tritium has a half-life of 12.5 y undergoing beta decay. What fraction of a sample of pure tritium will remain undecayed after 25 y.

Two blocks m_(1) 5g and m_(2) = 10 g are hung vertically over a light frictionless pulley. What is the acceleration of the masses when left free?

Solution of two volatile liquids x and y obey Raoult's law. At a certain temperature it is found that when the total pressure above a given solution is 400 mm of Hg , the mole fraction of x in the vapour is 0.45 and in the liquid is 0.65 . What are the vapour pressures of two pure liquids at the given temperature?