16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
160
18 plus 18 plus 18 equals 54. This can be calculated by adding the first two 18s together to get 36, and then adding the third 18 to get the final sum of 54. This is a basic arithmetic operation involving addition of three numbers.
18 + 25 + 32 = 75
1x72 2x36 3x24 4x18 6x12 8x9
so, 8x9 is blank space times 4x9
72.28571429 72 2/7 506/7
8x9=72; 72-12=60; 60-8=52.
The factors of 72 are: 36, 2, 24, 3, 18, 4, 12, 6, 9, and 8.
72
8x9=72
72. 18*4=72
8x9=72
18+18+18+19+23+23+24+24=167
72 but there is such a thing as a CALCULATOR
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
16 + 16 + 18 + 18 = 68