# 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 only. 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:

For 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 want 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?*