Ms. maryna has 10 lbs of 25% sugar syrup. how much sugar does she need to add to make 40% sugar syrup?

Ms.maryna needs 16 pounds of sugar. first you multiply 10 by 4 (25% times 4 is 100%) so that's 40 so you just turn 40% into a decimal (.40 you but the decimal over to the left two places everytime) and then you multiply 40 by .40 which is 16 : )