En is 80 years old and her grandson mark is 5 years old. in how many years will jen be 4 times older than mark?
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I've attached a photo of the solution below. Hope it helps!
<em>Rearrange unknown terms to the left side of the equation</em>
<em>Calculate the sum or difference.</em>
<em>Convert decimal to fraction.</em>
<em>Reduce the greatest common factor for both sides of the inequality.</em>
<em> </em>
<em>Reduce the fraction</em>