3 years ago

Jamar is four times as old as Josh. In 20 years he will be twice as old as Josh. How old is Jamar?

Mathematics

1 answer:

Juliette [100K]3 years ago

5 0

Simultaneous equations
Jamar=J
Josh=j
4J=j
20+J=2j
Then
4J=j
-4 (J)=-4(2j-20)
So
0=-7j+80
7j=80
j=80÷7

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