butterfly732001 butterfly732001
  • 09-08-2017
  • Mathematics
contestada

25 decreased by one fifth of a number is 18 find the number

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jrivera540 jrivera540
  • 09-08-2017
25 - (1/5)x = 18

Subtract 25 from both sides:
25 - (1/5)x - 25 = 18-25
(-1/5)x = -7

Multiply both sides by -5:
-5(-1/5)x = -5(-7)
x = 35

Answer: 35
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paranoidjordan
paranoidjordan paranoidjordan
  • 09-08-2017
Well first find the difference between 18 and 25 which is 7. This tells us that seven is one fifth of a number. 7 times 5 is 35 which is your answer.
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