15. A number consists of two digits whose sum is 8. If 18 is added to the
number its digits are reversed. Find the number
Answers
Answered by
0
Answer:
10x + (8 - x) + 18 = 10(8 - x) + x
→ 10x + 8 - x + 18 = 80 -10x + x
- 9x + 26 = 80 - 9x
- 9x + 9x = 80 - 26
- 18x = 54
» x = 54/18
X = 3
Answered by
0
Step-by-step explanation:
let the first digit be x
let the second digit be 8-x
original no.___
digit at tens place = 8-x
digit at ones place = x
no.= 10(8-x)+x
=80-10x+x
= 80-9x
new no.___
digit at tens place=x
digit at ones place= 8-x
no. = 10x+8-x
=10x-x+8
=9x+8
to find the no.___
9x+8+18=80-9x
9x+9x=80-18
18x=62
x=62÷18
x=3
original no.___
=80-9x
=80-9×3
=80-27
=53
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