Class 7 Question

A number consists of two–digits whose sum is 8. If 18 is added to the number its digits are reversed. What is that number?
  • a)
    35
  • b)
    36
  • c)
    53
  • d)
    63
Correct answer is option 'A'. Can you explain this answer?

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Answers

Rahi Patel Dec 21, 2019
Option A is correct

Varsha Oct 09, 2019
Let the unit’s digit be x.
10’s digit = 8–x.
Number = 10(8–x) + 1×x
= 80 – 10x + x = 80 – 9x
and 80 –9x + 18 = 10 × x + (8–x) 1
⇒ 98 –9x = 10x + 8 –x
⇒ 98 –9x = 9x + 8

Number = 80 – 9×5 = 80 – 45 = 35

Vinay E Oct 21, 2021
Option A correct

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