19
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To find the product of 5 and 6, you multiply them: 5 x 6 = 30. Next, you find the sum of 5 and 6: 5 + 6 = 11. Finally, you subtract the sum from the product: 30 - 11 = 19. So, subtracting the sum of 5 and 6 from their product number gives you 19.
The sum of 8 and 5 is 13. There is then no number with which to calculate its product.
10: 3n = 2(n + 5); 3n = 2n + 10; (subtract 2n from each side) n = 10.
6(3n+5)
5 - the other number is 3
3 and 5