SOLUTION: I'm having difficulty solving this problem, can you help me get started? Here goes: Mary and her brother John collect foreign coins. Mary has four times the number of coins that J

Question 125872This question is from textbook
: I'm having difficulty solving this problem, can you help me get started? Here goes:
Mary and her brother John collect foreign coins. Mary has four times the number of coins that John has. Together they have 150 foreign coins. Find how many coins Mary has. This question is from textbook

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Mary has four times the number of coins that John has. Together they have 150 foreign coins. Find how many coins Mary has.
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Let the number of coins John has be "x".
The the number of coins Mary has is "4x"
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EQUATION:
x + 4x = 150
5x = 150
x = 30
John has x = 30 coins
Mary has 4x = 4*30 = 120 coins.
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Cheers,
Stan H.
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