isaic6875 isaic6875

20-04-2017
Mathematics

contestada

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

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anmonymous anmonymous

20-04-2017

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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