In what ratio should a 20% methyl alcohol solution be mixed with a 50% methyl alcohol solution so that the resultant solution has 40% methyl alcohol in it?

A cube of side 5 cm is painted on all its side. If it is sliced into 1 cubic centimeter cubes, how many 1 cubi...

Moyna has n chocolates, where n is an integer such that 20

In how many ways can Annie, Bushra, Camelia, Don, Elina and Farzana be seated if Annie and Bushra cannot be se...

If a and b are integers greater than 100 such that a+b=300, which of the following could be the exact ratio of...

Ehsan can mow the lawn in 30 minutes, and together with his brother Asif, they can mow the lawn in 20 minutes....

In a class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female...