Question 125872
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.