Math Word Problems Demystified - A Self Teaching Guide

Substitute in the second equation and solve forx.

50 xþ 75 ð 40 
xÞ¼ 2325

50 xþ 3000 
 75 x¼ 2325

 25 xþ 3000 ¼ 2325

 25 xþ 3000 
 3000 ¼ 2325 
 3000

 25 x¼
 675

 251 x


 251

¼

675

25

x¼ 27

Findy:

xþy¼ 40

27 þy¼ 40

27 
 27 þy¼ 40 
 27

y¼ 13

Hence he sold 27 bags of $0.50 candy and 13 bags of $0.75 candy.

LESSON 18 Using Two Equations 225