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75% of 19 questions = 19*75/100 = 14.25 But that begs the question as to what a quarter of a question is.
If you missed 19, that means you got 56 correct (75 - 19 = 56) 59/75 = 0.7466666667, or approximately 75%
No, 75 is not a square number.
A number minus 15% is 75 So 85% of the number is 75 then the original number is 75/0.85 = 88.23529 (to 5 dp).
double previous number then alternately either add 1 or deduct 1 9 x 2 = 18 then + 1 = 19 19 x 2 = 38 then - 1 = 37 37 x 2 = 74 then + 1 = 75 75 x 2 = 150 then - 1 = 149 149 x 2 = 298 then + 1 = 299 299 x 2 = 598 then - 1 = 597