Math Word Problems Demystified - A Self Teaching Guide

3 xþ 22 x¼ 44 
 22 xþ 22 x

25 x¼ 44

251 x

25

¼

44

25

x¼ 1 :76 hours

Find the distance usingD¼RT.

D¼RT

D¼ 3 ð 1 : 76 Þ

¼ 5 :28 miles

EVALUATION: The time he rode the bus is 2
1.76¼0.24 hours. The

distance isD¼RT.

D¼RT

D¼ 22 ð 0 : 24 Þ

¼ 5 :28 miles

EXAMPLE:A merchant mixes some coffee costing $4 a pound with some

coffee costing $3 a pound. How much of each must be used in order to make

20 pounds of mixture costing $3.75 a pound?

SOLUTION:

GOAL: You are being asked to find how much of each coffee should be used.

STRATEGY: Letx¼the amount of $4 coffee used

andy¼the amount of $3 coffee used

216 LESSON 18 Using Two Equations