Math Word Problems Demystified - A Self Teaching Guide

14 xþ 276 
 276 ¼ 374 
 276

14 x¼ 98

141 x

141

¼

98

14

x¼ 737 c stamps

12 
x¼ 12 
 7 ¼ 523 c stamps

8. Letx¼the number of sandwiches and (80
   x)¼the number of bars;
   then the cost of the sandwiches is 69xand the cost of the bars is
   75(80
   x).

69 xþ 75 ð 80 
xÞ¼ 5808

69 xþ 6000 
 75 x¼ 5808

6000 
 6 x¼ 5808

6000 
 6000 
 6 x¼ 5808 
 6000

 6 x¼
 192

 61 x


 6

¼

192

6

x¼32 sandwiches

80 
x¼ 80 
 32 ¼48 bars

9. Letx¼the number of reams of college-ruled paper and 9
   x¼the
   number of reams of wide-ruled paper; then the cost of the college-
   ruled paper is 159xand the cost of the wide-ruled paper is 229(9
   x).

159 xþ 229 ð 9 
xÞ¼ 1571

159 xþ 2061 
 229 x¼ 1571

 70 xþ 2061 ¼ 1571

 70 xþ 2061 
 2061 ¼ 1571 
 2061

116 LESSON 11 Solving Coin Problems