A train went 300 miles from city X to city Y at an average speed of 80 miles per hours ( mph ). At what speed did the train travel on the way back if its average speed for the whole ( both ways ) trip was 100 mph?

What is the minimum number of apples that must be added to the existing stock of 264 apples so that the total...

If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount...

K produces 100 parts twice as fast as G does. G produces 100 parts in 40 minutes. If each produces parts at a...

If 18 is 15 percent of 30 percent of a certain number , what is the number ?

Last year the sales of Store X in December was 4 times the average of the monthly sales totals for January thr...

If TK. 1,000 is invested in a account paying 10% compounded monthly, how much would be the nearest ending bala...