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1. What is the two-digit number? I. The difference between the two digits is 9. II. The sum of the digits is equal to the difference between the two digits.
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By: guest on 01 Jun 2017 05.48 pm
Let the tens and unit digits be x and y respectively. Then, I. x - y = 9. II. x + y = x - y. From I and II, we get x - y = 9 and x + y = 9. On solving, we get x = 9 and y = 0. Required number is 90. Thus, both I and II are needed to get the answer. Correct answer is (E).