A piece of work can be done by 70 labors in 30 days. How many labours should work daily to complete the work in 12 days?

If x:y = 5:3 then (8x-5y):(8x+5y) = ?

A toy was bought for Tk 75 and sold at a gain of 8%. What was its selling price in Tk ?

If a man's salary is 20% more than that of his son, how many percent is the son's salary if compared to the sa...

A woman is 30 times older than her son. 18 years later she will be thrice as old as her son. What is the woman...

If x men can do a work in 8 days and x+4 men can do it in 6 days, what is the value of x ?

If product of two sequential positive odd numbers is 255, what are those numbers ?