What is the value of the two-digit number? I. There is a nine-digit discrepancy between the two digits. II. The difference between the two digits is equal to the total of the digits.
A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are necessary to answer
Answer:D
What is the value of the two-digit number? I. There is a nine-digit discrepancy between the two digits. II. The difference between the two digits is equal to the total of the digits.
A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are necessary to answer
Explanation: Let x and y be the tens and unit digits, respectively. Thenx - y = 9. I. x - y = 9.x + y = x - y is the second rule.We obtain x - y = 9 and x + y = 9 from I and II.We obtain x = 9 and y = 0 after solving.The required number of people is 90.As a result, both I and II are required to obtain the anagram.