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Find the value of 1 set of 3 coins = $1.70

$30.60 ÷ $1.70 = 18

Hence 18 sets. Therefore 18 fifty cent coins.

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That’s an interesting method.

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If Bob had u twenty-cent coins, he had u fifty-cent coins and u one dollar coins.

0.2u + 0.5u + u = 30.6

1.7u = 30.6

u = 18

So Bob had 18 fifty-cent coins.

 

 

Check: 18( 0.2 + 0.5 + 1 ) = 18 * 1.7 = 30.6 checked

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