Need ? sorry for my erased writing

Because you are given the ingredients for one batch, and you want the ingredients for four batches, you can multiply all of the original quantities by 4 to find the answers.

1 1/2 × 4
To do this, first convert 1 1/2 into a mixed number by doing 1 × 2 = 2, and 2 + 1 = 3, which would be the numerator. This then gives you
3/2 × 4/1, which simplifies to 12/2, which means your answer is 6.

1 × 4 = 4

1 × 4 = 4

3 × 4 = 12

3/4 × 4 = 3
(you cancel out the "/4" because you're multiplying by 4)

1 × 4 = 4

1/3 × 4/1 = 4/3

I hope this helps!

20 percentage, you can also do it on a calculator.