Q1: For slaking of 10 kg of CaO, the theoretical amount of water is

ANS:C - 3.2 kg

It means scaling down one of the variables to a single unit, i.e. "1". Didn't make you satisfy, ok here is an example if six coins weight is 66. Then what is the weight of 17 coins?

Consider the weight of one coin first.

1 coin weighs 66/6 = 11.

Now it is easy to calculate the cost of seventeen coins.

17 coins weigh 17 x 11 = 187.