In January, the value of a stock increased by 25%, and in February, it decreased by 20%.How did the value of the stock at the end of February compare with its value at the beginning of January?

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

On a test consisting of 80 questions, Nasir answered 75% of the first 60 questions correctly. What percent of...

A hospital has enough pills on hand to treat 10 patients 14 days. How long will the pills last if their are 35...

Avi drove from his home to college at 60 miles per hour. Returning over the same route, there was a lot of tra...

Let A be the set of primes less than 6,and B be the set of positive odd numbers less than 6. How many differen...

A researcher computed the mean, the median and the standard deviation for a set of performance scores. If 5 we...