Question 1106519
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The other tutor misread the problem....<br>
Let x be Derek's age; then Andy's age is (50-x).
In 5 years, Derek's age will be (x+5); Andy's will be (55-x).<br>
The problem says Andy's age in 5 years will be 4 times Derek's current age:
{{{55-x = 4x)}}}
{{{55 = 5x}}}
{{{11 = x}}}<br>
Derek's age is x=11; Andy's age is 50-x = 39.