Posted by Allysa on Wednesday, May 12, 2010 at 6:44am.
Mrs Allen spends 3/5 of her money at the grocery store. Next she spends 3/5 of her remaining money at the petrol station. She then has $8.00 left.
I know the answer is $50
BUT I need to explain why its right
please explain on a yr 7 level would be helpful!

Math  Reiny, Wednesday, May 12, 2010 at 7:14am
She spends 3/5 of her money, so she had 2/5 of it left
Then she spends (3/5) of her remaining money, which would leave her with (2/5)(2/5) = 4/25 of her money
so 4/25 of her money equals 8
1/25 of her money equals 8/4
then 25/25 of the money equals 25(8/4) = 50

Math  Allysa, Wednesday, May 12, 2010 at 4:28pm
thank you! U have saved the day!!!
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