It is: 2*(16+4) = 40
How about: 4+12 = 16
16 and 20
40
12 and 4.....12+4=16 12x4=48
12 and 16 3*4 = 12 4*4 = 16
10 and 6
16 and 12
4 times the sum
4 + 12 = 16 4 x 12 = 48
12 and 16 = 28 3*4 = 12 4*4 = 16
two real numbers, whose sum is 8 and product is max, are 4,4. 4+4=8 and 4*4=16.
4 and 5 4 + 5 = 9 42 + 52 = 16 + 25 = 41