Todd is moving sand from his driveway to the backyard. The wheelbarrow weighs 30 kilograms when it is full of sand. When it is empty, it weighs 12 kilograms. How many grams of sand did Todd move if he filled and emptied the wheelbarrow five times?
Is it right or wrong?
math - Reiny, Thursday, May 2, 2013 at 8:01am
sand = 30 - 12 kg = 18 kg per load
Now, he did this 5 times
amount of sand moved = 5(18) = 90 kg
= 90000 g , since 1 kg = 1000 g (kilo --> thousand)
math - Will, Thursday, May 2, 2013 at 8:08am
30 kg -12kg=18 kg
18kg*5loads=90kgs of sand
90,000grams of sand