Solve the problem.
-Mary and her brother John collect foreign coins. Mary has twice the number of coins that John has. Together they have 90 foreign coins. Find how many coins Mary has.
A)60 coins
B)54 coins
C)30 coins
D)12 coins

Question

Quizplus · Accepted Answer

Mary has twice the number of coins that John has, so if John has x coins, Mary has 2x coins. Together, they have x + 2x = 3x coins, which equals 90. Solving 3x = 90 gives x = 30 (John's coins), so Mary has 2x = 60 coins.

Solve the Problem. -Mary and Her Brother John Collect Foreign Coins. Mary Has