Simplify 12a3b2 ÷ 4ab−2.
Orange juice concentrate is mixed with water in the ratio 2 : 5. This mixture is then mixed with lemonade in the ratio 3 : 4. What is the ratio of orange-juice concentrate to lemonade in the final mixture?
A triangle has side lengths in the ratio 3 : 4 : 5. If the perimeter of the triangle is 84 cm, what is the length of the shortest side
Jam is made from 4 parts fruit to 3 parts sugar. How much sugar is needed to make jam from 1kg of fruit?