Asked by Anonymous

Ben and Corey each had a collection of rocks. Corey had 4/9 as many rocks as Ben. When Ben lost 35 rocks, Corey then had twice as many as Ben. How many rocks were in Ben's collection at first?

Answers

Answered by mathhelper
Ben's rocks --- x
Corey's rocks --- (4/9)x or 4x/9

after the loss:
Ben had x-35

4x/9 = 2(x-35)
times 9
4x = 18(x-35)
4x = 18x - 630
-14x = -630
x = 45

state the conclusion
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