One half of a number added to two thirds of the number is 21 . find the number.

Lorenzo ate 2/5 of his bag of almonds. his 4 friends ate equal shares of the remaining bag of almonds?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year