## 12. Jun Wei has 12 more 10-cent coins than 20-cent coins. The total value of all his coins is $5.40. Find the total number of coin

Question

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## Answers ( )

Answer:He has 40 coins

Step-by-step explanation:20 cent: x

10 cent: y

y: x + 12

10y + 20x = 5.40 dollars

10(x+12) + 20x = 5.40 X 100

10x + 120 + 20x = 540 cents

10x + 20x = -120 + 540

30x = 420

30x=42030 30

x = 14

x + 12 = 26

26 + 14 = 40

Thus he has 40 total coins, comprising of 14 coins 20 cents and 26 coins of 10 cents.Source: New Syllabus Mathematics 1, 7th edition