UP SI MATHS QUIZ-58

A sum invested at compound interest amounts to Rs.8,000 in 4 years and Rs.8,400 in 5 years, interest being compounded yearly. What will be the amount of the same sum at the end of the 6th year?

What is the highest common factor of $\frac{7}{10}, \frac{21}{32}$ and $\frac{49}{8} ?$

The ratio of acid to water in solutions A and B is 2 : 7 and 4 : 5, respectively: these solutions are mixed in the ratio of 4 : 3. What is the ratio of acid to water in the resulting solution?

By selling an article at $\frac{7}{12}$ of its selling price, a man loses $16 \%$. If he sells it at $90 \%$ of its original selling price, then what will be the profit percentage?

A person rows upstream a distance of $55 \mathrm{~km}$ in 5 hours and rows downstream a distance of $75 \mathrm{~km}$ in 3 hours. How much time will he take to row a distance of $96 \mathrm{~km}$ in still water?

A can do a piece of work in 15 days, but with the help of $B$, he can do it in 9 days. In what time can B do it alone?

Rohan scored 70 and 75 marks in the first two tests. How many marks should he score in the third test to get an average of 70 marks?

A sum of Rs.11236 is divided among A, B and C such that the ratio of the shares of A and B is 3 : 5 and the ratio of the shares of A and C is 4 : 7 . The share of B is:

A father’s age at the time of the birth of his son is the same as the present age of the son. If the age of the son was 15 years five years ago, then what is the current age of the father?