Math Word Problems Demystified - A Self Teaching Guide

x¼$5000 invested at 7%

12,000
x¼12,000
 5000 ¼7000 invested at 5%

9. Letx¼the amount of money invested at 1% and 3x¼the amount of
   money invested at 4% andxþ 400 ¼the amount of money invested
   at 3%.

1 %xþ 4 %ð 3 xÞþ 3 %ðxþ 400 Þ¼$ 108

0 : 01 xþ 0 : 04 ð 3 xÞþ 0 : 03 ðxþ 400 Þ¼ 108

0 : 01 xþ 0 : 12 xþ 0 : 03 xþ 12 ¼ 108

0 : 16 xþ 12 ¼ 108 
 12

0 : 16 x¼ 96

0 : 161 x

0 : 161

¼

96

0 : 16

x¼$600 invested at 1%

3 x¼ 3 ð 600 Þ¼$1800 invested at 4%

xþ 400 ¼ 600 þ 400 ¼$1000 invested at 3%

10. Letx¼the amount of money to be invested at 4%.
    6 %ð$ 3000 Þþ 4 %x¼$ 372

0 : 06 ð 3000 Þþ 0 : 04 x¼ 372

180 þ 0 : 04 x¼ 372

180 
 180 þ 0 : 04 x¼ 372 
 180

0 : 04 x¼ 192

0 : 041 x

0 : 041

¼

192

0 : 04

x¼$ 4800

LESSON 15 Solving Finance Problems 171