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

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 coins he has.​

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Lyla 1 month 2021-08-21T22:36:55+00:00 1 Answer 0 views 0

Answers ( )

    0
    2021-08-21T22:38:18+00:00

    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  = 420

    30          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

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