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Answer

20-cent coins : 6 units
50-cent coins : 3 units
$1 coins : 5 units

6 x 0.20 + 3 x 0.50 + 5 = 7.70 (1 set)
23.10/7.70 = 3 (sets/groups of 7.70)
3 x (6 + 3 + 5) = 42

Ans : 42 coins.

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This is a Quantity Each Product question.

LCM

1/3 = 2/6

2/3

   Quantity  Each    Product
20c  6u 0.2 1.2u
50c 3u 0.5 1.5u
$1 5u 1 5u
Total    14u   7.7u

7.7u = 23.1

1u = 23.1 ÷ 7.7 = 3

14u = 14 × 3 = 42 coins.

 


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