Question 607397
An object's weight on the moon, M varies directly as its weight on Earth, E.
 A person who weights 55 kilograms on Earth weighs 8.8 kilograms on the moon.
 What is the moon weight of a person who weights 90 kilograms on Earth?
 Is it 14.4 Kg? 
:
Solve this as a ratio equation, Let w = his weight on the moon
{{{w/8.8}}} = {{{90/55}}}
Cross multiply
55w = 8.8 * 90
55w = 792
w = {{{792/55}}}
w = 14.4 kg on the moon