Problema Solution
A box of marbles weighs 12 pounds when it is 3/4 full. It weighs 2.9 pounds when it is 1/6 full. What is the weight of the box?
Answer provided by our tutors
let weight of box = x pound
and weight of full marbles = y
x + 3/4 y = 12
x + 1/6 y = 2.9
=> 7/12 y = 91/10
=> y = 15.6
=> x = 0.3 pounds