CAT (QA) PYQs

In May, John bought the same amount of rice and the same amount of wheat as he had bought in April, but spent Rs. $150$ more due to price increase of rice and wheat by $20 \%$ and $12 \%$, respectively. If John had spent Rs. $450$ on rice in April, then how much did he spend on wheat in May?

The total of male and female populations in a city increased by $25 \%$ from $1970$ to $1980$.During the same period, the male population increased by $40\%$ while the female population increased by $20\%$. From $1980$ to $1990$, the female population increased by $25 \%$. In $1990$, if the female population is twice the male population, then the percentage increase in the total of male and female populations in the city from $1970$ to $1990$ is

In 2010, a library contained a total of 11500 books in two categories - fiction and non-fiction. In 2015, the library contained a total of 12760 books in these two categories. During this period, there was 10% increase in the fiction category while there was 12% increase in the non-fiction category. How many fiction books were in the library in 2015?