# 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 |

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 have 400g of chocolate, how many cakes can we make, and what quantity of cornflakes do we need?*