Math Word Problems Demystified - A Self Teaching Guide

x¼4 (one’s and ten’s digit)

x
 3 ¼ 4 
 3 ¼1 (hundred’s digit)

The number is 144.

10. Letx¼the ten’s digit andx
    5 ¼the one’s digit; then
    10 xþx
    5 ¼ 8 ðxþx
    5 Þ

11 x
 5 ¼ 8 ð 2 x
 5 Þ

11 x
 5 ¼ 16 x
 40

11 x
 16 x
 5 ¼ 16 x
 16 x
 40

 5 x
 5 ¼
 40

 5 x
 5 þ 5 ¼
 40 þ 5

 5 x¼
 35

 51 x


 51

¼

35

5

x¼7 (ten’s digit)

x
 5 ¼ 7 
 5 ¼2 (one’s digit)

The number is 72.

LESSON 10 Solving Digit Problems 107