Answer is 3
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Work Shown:
x = some unknown number
x+12 = adding 12 to the unknown number
4(x+12) = multiplying the previous sum by 4
4(x+12) = 60 .... set this equal to the desired result we want
Now solve for x. We will undo the steps done above to isolate x
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4(x+12) = 60
x+12 = 60/4 .... divide both sides by 4 to undo "multiply by 4"
x+12 = 15
x = 15-12 .... undo "add 12" by subtracting 12 from both sides
x = 3
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The unknown number is 3
add 12 to it to get 3+12 = 15
multiply that sum by 4 to get 15*4 = 60
Answer is confirmed.