Joe goes camping with his dad on a Friday. Joe's dad has 21 marshmallows, and Joe has four times as much marshmallows as his dad. If Joe’s dad roasts a third of his marshmallows, and Joe roasts half of his marshmallows, how many marshmallows did they roast in total?
Joe’s dad roasts 21/3 = <T>divide(21, 3)=7.0 of his marshmallows.
Joe has 21*4 = <T>multiply(21, 4)=84 marshmallows.
Joe roasts 84/2 = <T>divide(84, 2)=42.0 of his marshmallows.
Joe and his dad roasted 7+42 = <T>add(7, 42)=49 marshmallows in total.
