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e)Since, We have assumed x is the number. The question changes to
x when multiplied by 5 is increased by 80
⇒ 5x = x + 80
To find x, unknowns should be on one side of the equation and constants on other side.
Subtracting x from both sides,
⇒ 5x - x = x + 80 - x
⇒ 4x = 80
Dividing by 4 on both sides
⇒ 4x ÷ 4 = 80 ÷ 4
⇒ x = 20
Therefore, The number is 20.
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