Question 1. Which one of the following is also known as solution?
a) A compound
b) A homogeneous mixture
c) A heterogeneous mixture
d) A suspension
Answer : b) A homogeneous mixture
It is easy to work with options. Only options which has the number in the ration 1:2 is Option C, hence the answer. As a double check, Just add 4 to each numbers in the given option and see whether it is in the ratio 2:3. If we add 4 to the numbers given in Option C ( 4 and 8 ) we get 8 and 12 which is in the ration 2:3 
A firm practising price discrimination will be Ans : c) Charging different prices in different markets for a product 
Here we have to use the concept of negative work.
