The population of a country doubled every 10 years from 1980 to 2010 . What was the percent increase in population during this time .

Two people were hired to plough a field for a total of Tk. 498 . They completed the job with one person workin...

A 140 liter mixture of milk and water contains 20% water. How much milk , in liter, must be added to the mixtu...

If 120% of x is equaly to 80% y, which of the following is equal to (x +y)?

If the product of four consecutive integers is equal to one of them , what is the largest possible value of on...

One day at a school , one-twelfth of the students were absent and 20% of those present went on a field trip. I...

For the final step in a calculation , chunnu accidentally accidentally divided by 1,000 instead of multiplying...