I got the factors of 40 but both numbers do not add up to 11. Negative numbers are not considered because the product and sum are positive numbers.
1 x 40 = 40 1 + 40 = 41 2 x 20 = 40 2 + 20 = 22 4 x 10 = 40 4 + 10 = 14 5 x 8 = 40 5 + 8 = 13
I also got the addends of 11 and solved each set to get the product 1 + 10 = 11 1 x 10 = 10 2 + 9 = 11 2 x 9 = 18 3 + 8 = 11 3 x 8 = 24 4 + 7 = 11 4 x 7 = 28 5 + 6 = 11 5 x 6 = 30
650 kgs is equal to 1,433 lbs. I believe the mistake would be that they forgot to add a period in between 65 and the 0, because 65.0 kgs is equal to 143.3 lbs.
