What will come in place of the question mark (?) in the following questions ?
2433 + 227 + 1278$$\div$$142 =?
34% of 820 × ? = 6133.6
$$9\frac{3}{7} + 6\frac{4}{7} - ? = 14\frac{4}{7}$$
(33858 $$\div$$ 33) $$\div$$ 18 = ?
19.5 $$\times$$ 21.14 + 64.78 = ?
3567.43 + 2788.17 - ? = 1379.56
18 $$\times$$ 17 - 500/10-240 = ?
For the following questions answer them individually
A and B together can finish a work in 9 days. A alone can finish the work in 12 days. In how many days will B alone finish the work ?
The ratio of the number of boys and girls in a school is 9 7. If the number of boys increases by 40%, and that of girls by 20% what will be the new ratio of the boys and girls respectively ?
In what time would the simple interest on a certain sum be 0.125 times the principal at 10% per annum ?