x¼4 (one’s and ten’s digit)
x 3 ¼ 4 3 ¼1 (hundred’s digit)
The number is 144.
- 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