If Sakib drove at 60 miles per hour for 2 hours, how far did he go in the last 20 minutes?

At Uttara High school each student studies exactly one foreign languages. Three-fifth of the students take Spa...

The average of 10 numbers is -10. If the sum of 6 of them is 100, what is the average of the other 4 ?

On a certain French-American committee, 2/3 of the members are men, and 3/8 of the men are Americans, If 3/5 o...

At 3 A.M. the temperature was 13 degree below zero. By noon, it had risen to 32. What was the average hourly i...

In January, the value of a stock increased by 25%, and in February, it decreased by 20%.How did the value of t...

The population of a country doubled every 10 years from 1960 to 1990. What was the percent increase in populat...