Question

Rita have enough money to buy 15 books for 30 each if the price of each book increase resulting in the total cost of increase of 45 how many how many books can see buy now? how much money will be left with her

Answer 1

$total \: money = 15 \times 30 = 450 \\ after \: increaed \: prise \\ 15 \times (30 + x) = 450 + 45 \\ 30 + x = 495 \div 15 = 33 \\ x = 33 - 30 = 3 \\ new \: price = 33 \\ 450 = 13 \times 33 + 30 \\ she \: buy \: 12 \: books \: and \: 30 \: rupees \: left \: with \: hr$