SOLUTION: Hi Jack had some 20cent and 10cent coins. When he used 1/3 of them he had $9.60 left. He used half as many 20cent as 10 cent coins. How many 20 cent coins did he use. Than

Question 1168246: Hi
Jack had some 20cent and 10cent coins. When he used 1/3 of them he had $9.60 left. He used half as many 20cent as 10 cent coins.
How many 20 cent coins did he use.
Thanks
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
let the number of 20cent coins be and the number of 10cent coins
amount of money is and
he has coins all together which gives him $
when he used of them he had $ left
.....both sides multiply by

......both sides multiply by
.....both sides divide by

if he used half as many 20cent as 10 cent coins, then
substitute and solve for

-> the number of cent coins
and

->the number of cent coins

check:

if he he used of them he had $ left

->true

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