1. The present average age of a family of four members is 36 yr. if the present age of the youngest member of the family be 12 yr, the average age of the family at the birth of the youngest member was (4)
(1) 48 yr
(2) 40 yr
(3) 32 yr
(4) 24 yr
2.The average of 30 number is 12. The average of, the first 20 of them is 11 and that of the next 9 is 10. The last number is ____ (4)
(1) 60
(2) 45
(3) 40
(4) 50
3.A, B and C started a business by investing Rs. 40500, Rs. 45000 and Rs. 60000 respectively. After 6 months C withdraws Rs. 15000 while A invested Rs. 4500 more. In annual profit of Rs. 56100, the share of C will exceed that of A by _____ (4)
(1) Rs. 900
(2) Rs. 1100
(3) Rs. 3000
(4) Rs. 3900
4.A sells an article to B at a profit of 10%. B sells the article back to A at a loss of 10%. In this transaction ____ (2)
(1) A neither loses nor gains
(2) A makes a profit of 11%
(3) A makes a profit of 20%
(4) B loses 20%
5.If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c =? (1)
(1) 2 : 1
(2) 14 : 3
(3) 7 : 2
(4) 1 : 2
