A began a business with Rs. 85, 000. He was joined afterwards by B with Rs. 42, 500. For how much period does B join, if the profits at the end of the year are divided in the ratio of 3: 1?

X and y invested in a business, they earned some profit which they divided in the ratio of 2: 3. If X invested Rs. 40, 000. The amount invested by Y is?

Arun, kamal and vijay invested Rs. 8000, Rs. 4000 and Rs. 8000 respectively in a business. Arun left after six months. If after eight months there was a gain of Rs. 4005, then what will be the share of kamal?