Question

Three girls share an amount of money. the eldest get b/3c of the total amount while the youngest gets b/6c of the total. what fraction does the third girl gets?​

Answer 1

(2c-b) / 2c

Explanation:

b/6c + b/3c + y = 1,

Because these are fractions they must add up to 1.

Add and simplify,

(6bc + 3bc)/18c^2

b/2c + y = 1,

Make y the subject,

y = 1 - b/2c

y = (2c-b)/2c