x and y started a business with capitals rs. 20000 and rs. 25000. after few months z joined them with a capital of rs. 30000. if the share of z in the annual profit of rs. 50000 is rs. 14000, then after how many months from the beginning did z join?

x and y started a business with capitals rs. 20000 and rs. 25000. after few months z joined them with a capital of rs. 30000. if the share of z in the annual profit of rs. 50000 is rs. 14000, then after how many months from the beginning did z join?