Martina, David, and Felipe have a total of $86 in their wallets. David has 2 times what Felipe has. Felipe has $10 less than Martina. How much do they have in their wallets?

Answer 1

Martina, David, and Felipe have a total of $86 in their wallets. David has 2 times what Felipe has. Felipe has $10 less than Martina. How much do they have in their wallets?

Martha = M

David = D

Felipe = F

Martina, David, and Felipe have a total of $86

Total indicates we will add them all together and get the TOTAL amount

M + D + F = $86

David has 2 times what Felipe has.

D=2F,

Felipe has $10 less than Martina. 10 less than Martha means that we take away or subtract 10 from Martha to eqaual Felipe

F=M-10

Substitute and Solve

M + D + F = $86

M + (2F) + (F)= 86

M + 2(M-10) + (M-10) = 86

M+2M - 20 + M -10 =86

4M -30 = 86

4M=116

M= 29

F= M-10 = 29-10= 19

D= 2F = 2(19) = 38

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