The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:
Correct answer A. 20
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See allThe sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?
Correct answer D. Cannot be determined
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
Correct answer B. 24
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The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1: 2?
Correct answer B. 8
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?
Correct answer B. 4
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