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Question

How to solve using models? Answer is $170. No Algebra method as p5 have not learnt it. Thanks! 

Answer

Let J be the amount of money James had at first.
Let S be the amount of money Sam had at first.

J = 240 + S … (1)

J + 30 = 2 (S + 50) … (2)

Substituting (1) into (2):
240 + S + 30 = 2S + 100
S = 240 + 30 – 100 = $170 #

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