Asked by Laura
Decrease a number by 5, divide the result by 2, then add 17 and multiply by 5. If the final result is 100, with what number did you start?
Answers
Answered by
PsyDAG
[( x-5)/2 + 17] * 5 = 100
Divide both sides by 5.
(x - 5)/2 + 17 = 20
Subtract 17 from both sides.
(x - 5)/2 = 3
Multiply both sides by 2.
x - 5 = 6
Add 5 to both sides.
x = 11
Divide both sides by 5.
(x - 5)/2 + 17 = 20
Subtract 17 from both sides.
(x - 5)/2 = 3
Multiply both sides by 2.
x - 5 = 6
Add 5 to both sides.
x = 11
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