Math riddles have also been known to make Mathematics enjoyable for kids, students, and even adults to solve. Riddles, puzzles, and brain teasers can develop strategic thinking, logical reasoning ...

Calculate percentages backward X% of Y = Y% of X. You can always swap those percentages if doing the math is easier the other way around. So 68% of 25 = 25% of 68 = 68/4 = 17.