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.

5 answers

Let x = ten and y = 20 cent coins

x = y+12

.10x + .20y = 5.40

Substitute y+12 for x in the second equation and solve for y. Insert that value into the first equation to solve for x. Check by putting both values into the second equation.

40

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Don't do this
And
The answer is 40

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