(c) The sum of digits of a two digit number is 7. If 9 is added to the number, the digits
mterchange their places. Find the number.
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Answer:
Step-by-step explanation:
let the once digit no. be x
tens digit no.= 7-x
original no. = 10 (7-x) +x =70-10x+x= 70-9x
new no. = 10x+7-x=9x+7
atq
70-9x+9=9x+7
9x+9x=79-7
18x=72
x=72/18
x= 4
tens digit no.= 7-x= 7-4= 3
the number is 34
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