49
1x1 4x4 7x7 10x10
add 3 to previous number then square it.
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49
You could put 49 in between the 16 and the 100.
16. 1 is added to the difference each time: 1 + 1 = 2 2 + 2 = 4 4 + 3 = 7 7 + 4 = 11 11 + 5 = 16 [the missing number] 16 + 6 = 22
400 X 4 / 100 = Cancel down by '100' Hence 4 x 4/1 = 16/1 = 16 The answer!!!!!
16 out of 112 = 16/112 x 100 % = 1/7 x 100 % ~= 14.29%