for the first one, it asks what is half of 12 (obliviously 6), so if that is half of 12, then it would be a quarter of 24( or 1/4)
the second: if 4 is1/5 of 20 (because 20 divided by 5 is 4), then it would equal 2/5 of 10, because if 4 is equivalent to 1/5 of the number 20, then divide that by 2, to get 4=2/5 of 10. (if you are ever unsure about this, resort to decimals. lets say that you don't know if the answer to the second equation is actually 10. then do this: you know that it is asking for 2/5 of_________. turn 2/5 into a percent to equal 40%. now, what number is 4 equivalent to 40%. and if you are still unsure, just divide 40 by 4.) hope this helps
