Math Word Problems Demystified - A Self Teaching Guide

IMPLEMENTATION: Solve the equation:

30

80

þ

30

x

¼ 1

The LCD¼ 80 x

80 x

1



30

80

þ 80  30 ¼ 80 x 1

30 xþ 80  30 ¼ 80 x

30 xþ 2400 ¼ 80 x

30 x
 30 xþ 2400 ¼ 80 x
 30 x

2400 ¼ 50 x

2400

50

¼

501 x

501

48 ¼x

Hence, it will take Jane 48 minutes to do the job alone.

EVALUATION: Check the equation:

30

80

þ

30

48

¼ 1

30

80

þ

30

48

¼ 1

0 : 375 þ 0 : 625 ¼ 1

1 ¼ 1

Try These

1. June can paint a shed in 9 hours and her father can paint it in 6
   hours. How long will it take if they both paint it together?


2. Mike can plow a field in 12 hours and his brother Phil can plow it in
   15 hours. How long will it take them to plow it if they use two plows
   and work together?

188 LESSON 17 Solving Work Problems