If 30g of sugar is needed to make 4 cakes how much grams of sugar is needed to make 7 cakes

There's two ways to do this.

The first way:

Work out the amount of sugar needed to make one cake, and then multiply that by 7.

30 grams : 4 cakes = 7.5 grams for 1 cake.

7.5 grams * 7 cakes = 52.5 grams for 7 cakes.

The second way:

Work out the ratio of sugar:cake by doing 7 : 4, and then multiplying that value by 30.

7 cakes : 4 cakes = 1.75

1.75 * 30 grams = 52.5 grams for 7 cakes.

Either way, the answer is 52.5 grams.