Tom is making plum crumble. For the crumble topping, he uses sugar, butter and flour in the ratio 2 : 3 : 5 Tom uses 250g of plums for every 400g of crumble topping. Tom has 0.5kg of plums. He uses all of them. Work out how much sugar, butter and flour he needs for the crumble topping. PLEASE I NEED EXPLANATION I ALREADY KNOW ANSWER Ans-sugar 160g butter-240g Flour-400g