The product of my age is five, then decreased by twenty and finally increased by my age times the opposite of three is fifty, how old am i

Set up a fraction with 2 cups of sugar (s) at the top and 32 brownies (b) at the bottom. 2s/32b. now, set up the next fraction with x cups of sugar (because we don't know the amount of sugar) at the top and 72 brownies (b) at the bottom. set them equal. your equation should be 2s/32b=x/72b. cross multiply these values (if you wrote them down; 32x=144) and solve for x.