Faiyaz and Ehan are standing 90 yards apart on a north-south axis, Faiyaz walks 70 yards to west. Ehan walks 50 yards to the east, and then both stop. What is the straight-line distance in yards between them now?

Suppose the number of people in Cumilla city is 1 million. If the number of males increases by 10% and the number of females decreases by 6%, then the number of people in city remains unchanged. What are the numbers of male and female in that city?

There are three containers A, i B and C which contain water, milk and acid respectively in equal quantities. 100% of the centent of A is taken out poured into B. Then, the same amount from B is transferred to C, from weich again the same amount is transferred to A. What is the proportion of milk in container A at the end of the process?

Kima invests Tk. 5000 in a bond which gives interest at 4% per annum during the first year, 5% during the second year and 10% during the third year. How much does she get at the end of the third year?

Given $\frac{2}{x}+\frac{2}{xy}=\frac{1}{6} and \frac{2}{x}+\frac{2}{y}=0, Find \text{'}a\text{'} for which y= ax-4.$