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7.	A started a business with Rs.21,000 and is joined afterwards by B with Rs.36,000. After how many months did B join if the profits at the end of the year are divided equally?
	A.  3
	B.  4
	C.  5
	D.  6

Solution

Suppose B joined after x months. Then, 21000×12=36000×(12 - x) ‹=›36x=180 = x= 5.

8.	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
	A.  Rs.45,000
	B.  Rs.50,000
	C.  Rs.60,000
	D.  Rs.80,000

Solution

Suppose Y invested Rs.y Then, 40000 /y = 2 / 3 ‹=› y=(40000×3 / 2). ‹=› y=60000.

9.	A and B started a business in partnership investing Rs.20,000 and Rs.15,000 respectively. After six months, C joined them with Rs.20,000. What will be B's share in the total profit of Rs.25,000 earned at the end of 2 years from the starting of the business?
	A.  Rs.7500
	B.  Rs.9000
	C.  Rs.9500
	D.  Rs.10,000

Solution

A : B : C =(20000×24):(15000×24):(20000×18) =4 :3 :3 B's share =Rs.(25000×3/10) = Rs.7500.