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Call the two numbers required m and n. Then from the problem statement, m = 25 - n (equation 1) and mn = 100 (equation 2). Substitute the expression for m in equation 1 into equation 2 to produce n(25 - n) = 100. Multiply out the left side to produce 25 n - n2 = 100. Multiply this equation by -1 and collect all terms on one side to produce n2 - 25n -100 = 0 (equation 3). Equation 3 factors into (n -20)(n-5) = 0, which is true when n = 20 or n = 5. From equation 1 again, this means m = 5 or 20 respectively. Therefore, the two numbers required are 5 and 20.
Check: 5 + 20 = 25; 5 X 20 = 100.
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What is 29.47 equals?
This number is equal to itself, and to no other number.This number is equal to itself, and to no other number.This number is equal to itself, and to no other number.This number is equal to itself, and to no other number.
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Given that the total you are looking for is even, and that you are looking for three numbers in your solution, one of the numbers has to be 2 - otherwise, three odd numbers added together would always equal an odd number. The other two numbers in the sum are 37 and 61.
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You don't always. 2 + 5 = 7, for example. But all prime numbers other than 2 are odd and two odd numbers always equal an even number when added together.
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