the expression of the product of 5 and a number
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If three is subtracted from the product to get 17, the product must be 20. Then find what number can be multiplied by 5 to get 20. The answer is 4.
25 can be either the product of 1 and 25, or the product of 5 and 5. Since there are two digits in the number, the answer can only be 55. This makes sense, since 55 is divisible by 5, and the product of 5 and 5 is 25.
The sum of 8 and 5 is 13. There is then no number with which to calculate its product.
n x (n -5)
x 35