DELHI POLICE MATHS QUIZ-60

By selling 16 oranges for a dollar, a person loses 20%. How many oranges should he sell for one dollar to make a profit of $60 \%$?

On a certain item, the profit is 120% of the cost. If the cost increases by 25% and the selling price remains constant, then what percentage of the selling price is the profit (correct to a whole number)?

A certain number of students from school A appeared in an examination and $65 \%$ of them passed. $100 \%$ more students than those in school A, appeared in the same examination from school B. If $75 \%$ of the total students that appeared from schools A and B passed, then what is the percentage of students who failed from school B?

What is the area of rhombus (in cm$^{2}$ ) whose side is 10 cm and the shorter diagonal is 12 cm ?

Which of the following fractions is the smallest?

$\frac{11}{12}, \frac{13}{14}, \frac{12}{13}, \frac{15}{16}, \frac{19}{20}$

Train A travelling at 55 km/h takes 21 seconds to completely cross train B travelling at 53 km/h in the opposite direction. The length of train A is 2.5 times the length of train B. Train A passes a bridge in 72 seconds. What is the length (in m) of the bridge?

The value of $\frac{8}{3} \div \frac{3}{4}$ of $\frac{5}{6}+\frac{4}{9} \div\left(\frac{3}{5}-\frac{1}{2}\right) \times \frac{9}{25}+\frac{3}{5} \times \frac{4}{9}-\frac{4}{9} \div \frac{2}{3}$ is:

If the radius of a circle is increased by $10 \%$, then what is the percentage increase in its area?

What will be the amount after 2 years, if a sum of ₹ 2,200 is invested at $12 \%$ per annum compound interest, compounded half-yearly (correct to two decimal places)?

Savita decides to donate 8% of her monthly income to a charitable trust. On the day of charity she changes her decision and donates an amount of ₹ 2,880 which is 20% less than the amount already earmarked for charity. What is his monthly income (in ₹)?