Question

mike's bill for stamps comes out to $ 19.35. He paid with a $ 20 bill. He got 8 coins back as change. is this possible? Explain..

Answer 1

$20.00-$19.35=0.65
You must do a guess and check!

0.65 cents is his change

He could have gotten:
2 Quarters (50 cents)=(2x25) Because there are two quarters and each are 25 cents
1 Dime (10 cents)=(1x10) because there is one dime and they are 10 cents
5 Pennies (5 cents)=(1x5) because pennies are 5 pennies and they are 1 cent a piece

CHECK
5+2+1 =8
8=8
So we have the correct number of coins

(2x25) + (1x10) + (5x1) =65
50+10+5=65
65=65
So we have the correct amount of change in cents 
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Answer 2

$Change:\\\\20-19.35=0.45\\\\0.45:8=0.05\\\\Its\ possible,\ he\ get\ back\ change\ in\ 0.05$