4: whose double is 8 and quarter is 1.
If the missing number is x, then:
2x = x/4 + 7
Multiply throughout by 4:
8x = x + 28
Subtract x from both sides:
7x = 28
Divide throughout by 7:
x = 4
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2x - 1/2 x = 991.5 x = 99x = 99 / 1.5 = 66
The answer is: 3
How about 27 whose cube root is 3 which is a rational whole number.
A prime number.
A perfect square.