Solve.
-Mary and her brother John collect foreign coins. Mary has twice the number of coins that John has. Together they have 105 foreign coins. Find how many coins Mary has.
A) 14 coins
B) 35 coins
C) 70 coins
D) 63 coins

Question

Quizplus · Accepted Answer

Mary has 70 coins. If Mary has twice the number of coins John has, let John's coins be x. Then Mary's coins are 2x. Together, they have x + 2x = 3x = 105 coins. Solving for x gives x = 35 (John's coins), so Mary has 2x = 70 coins.

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