Book Maths Puzzle Logical Reasoning

How many parallelograms are formed when a set of 5 parallel lines intersects a set of 4
parallel lines?
Details and Assumptions
 All parallel lines are extended indefinitely.

Read Solution (Total 1)

Ans is 12. (5-1)*(4-1)=4*3=12
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Book Other Question

1. A started a business with a capital of INR 20,000. Some months later B joins the business with a capital of INR 30,000 and few more months later C joins the business with the capital of INR 30000. At the end of the year, out of a total profit of INR 132000, all the three receive salaries of INR 3000 for every month they were in the business. The remaining profit is then shared among the three in the ratio of their investments. B’s salary forms half of the total amount he received. Find the total amount received by A. Rusabh sold some cds to rushant at the rate of 4 cds for the cost price of three.After a few days rushant sold the same cds back to rusabh at the rate of 3 cds for the price he had paid for four.Find the % loss incurred by rusabh?