You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?
The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?