CAT (QA) PYQs

In a group of people, $28\%$ of the members are young while the rest are old. If $65\%$ of the members are literates, and $25\%$ of the literates are young, then the percentage of old people among the illiterates is nearest to

After two successive increments, Gopal's salary became $187.5 \%$ of his initial salary. If the percenta of salary increase in the second increment was twice of that in the first increment, then the percenta; of salary increase in the first increment was

A box has $450$ balls, each either white or black, there being as many metallic white balls as metallic black balls. If $40 \%$ of the white balls and $50 \%$ of the black balls are metallic, then the number of non-metallic balls in the box is