There are some boys and girls in a room. The square of the number of the girls is less than the square of the number of boys by 28. If there were two more girls the number of boys would have been the same as that of the girls The total number of the boys and girls in the room are
1). 56
2). 14
3). 10
4). 7
2. What is the simplified form of 412 × 1635 × 6415?
5. If √20 + √125 = 15.65, then what is the value of √45 + √5?
6. Simplify : $1+\frac{2}{1+\frac{3}{1+\frac{4}{5}}}$
8. The value of $\frac{(75.8)^{2} -(55.8)^{2}}{20}$ is
9. What should come in place of ‘?’ in the following number series? 353, 345, 318, 254, ?