Question 1036992
U = 4J We'll use this value for U next:
U+10 = 2(J+10)+20
4J+10 = 2J+20+20
4J+10 = 2J+40 subtract 2J and 10 on both sides
2J = 30
J = 15
Jim is 15 and his uncle 4*15 = 60
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Check:
In 10 years
U+10 = 2(J+10)+20
60+10 = 2(15+10)+20
70 = 30+20+20 = 70 Correct