70 x¼ 490
701 x
701
¼
490
70
x¼7 reams of college-ruled paper
9 x¼ 9 7 ¼2 reams of wide-ruled paper
- Letx¼the number of $5 bills, 2x¼the number of $1 bills, and
x 1 ¼the number of $10 bills; then the value of the $5 bills is 5x,
the value of the $1 bills is 1 2 x, and the value of the $10 bills is
10(x1).
5 xþ 2 xþ 10 ðx 1 Þ¼ 75
5 xþ 2 xþ 10 x 10 ¼ 75
17 x 10 ¼ 75
17 x 10 þ 10 ¼ 75 þ 10
17 x¼ 85
171 x
171
¼
85
17
x¼5 five-dollar bills
2 x¼ 2 5 ¼10 one-dollar bills
x 1 ¼ 5 1 ¼4 ten-dollar bills
LESSON 11 Solving Coin Problems 117