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# Concept - Pairing

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Lucas has 4 fewer one-dollar coins than ten-cent coins. The total value of all the coins $7. How many coins does Lucas have in all? Apr 20, 2021 ### 2+0 Answers #1 +119 +2 4 *$1 = $4$7 + $4 =$11 (Cost of same number of each

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$1 +$0.10 = $1.10 (Value of 1 pair)$11 ÷ $1.10 = 10 (pairs) 10 * 2 = 20 20 - 4 = 16 Lucas has 16 coins in all. Apr 20, 2021 edited by Tgfromthe4 Apr 20, 2021 #2 +496 +1$100\cdot(x-4)+10\cdot{x}=100x-400+10x=700110x=1100x=1010+(10-4)=\boxed{16}\$

Apr 20, 2021