The correct option is A 140 kg
Given, 4 members require = 40 kg of wheat flour
Since, number of members increases by 10
So number of members in the family now = 4 + 10 = 14
Let, 14 members require d kg of wheat flour
Writing in Proportion form, we have
4 : 40 :: 14 : d
Product of means = Product of extremes
⇒ 40 × 14 = 4 × d
⇒ d = 40×144
⇒ d = 140
So, 14 members will require 140 kg of wheat flour.