21 You have two pieces of information regarding a two-digit number
Information I: The sum of its digits is 9
Information II: If the digits are reversed, the number is 63 more than the original. (Assume we are taking two digit number such that digit in the unit’s place is x
Which one of the following is the correct equation to find the number?
a) 10x+9-x =63 + 10(9-x) +x
b) 10(9-x) +x =63+10x+9-x
c) 10x+9-x = 63-10(9-x) +x
d) 10(9-x) +x =63-10x+9-x
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Answer:
a) 10x+9-x = 63 + 10(9-x)+x
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