SOLUTION: David has several coins in his piggy bank. David's sister has four times as many coins as David. Together they have 90 coins. How many coins does David have? How many does his sist

Question 590374: David has several coins in his piggy bank. David's sister has four times as many coins as David. Together they have 90 coins. How many coins does David have? How many does his sister have?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the number of coins David has
David's Sister has coins
given:

------------
David has 18 coins
Sister has 72 coins
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