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# Ratio - Make Some Chocolate Crispies

 To make these chocolate crispies I used: 20 g (grams) of chocolate 15 g of cornflakes or similar This made 1 cake. Recipe Here Your mathematics task is to: 1) calculate the ratio of chocolate to cornflakes, and then: 2) work out the amount of ingredients to make 21 cakes. 1) We can see that the ratio of chocolate to cornflakes is 20:15 But this can be simplified further. The Greatest Common Factor is 5, so: If we have 20 parts chocolate to 15 parts cornflake, divide each side by 5 and we get 4:3 This is the ratio of chocolate to cornflakes. 2) We need to work out how much chocolate and cornflakes we need to make 21 cakes. The recipe is for 1 cake but we want 21, so multiply both ingredients by (21 cakes / 1 cake), or simply by 21:   21×20 = 420 21×15 = 315 So to make our 21 cakes we need: 420 g of chocolate 315 g of cornflakes   Question: If we only had 400g of chocolate, how many cakes could we make, and what quantity of cornflakes would we need?