1. One problem like 5pigs cost is same as 25 dogs which is equal 12 elephants if 15  elephants is 2500 what is value of 1 pig. (numbers arenot .same.)  2. One man brought pen and book from 250 and he sold both at 10% profit on pen and 20% loss on book and finally he gained 40% what is the value of pen (numbers are not same)