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Q6. The average of five numbers is 45 . If one number is excluded, the average becomes 42 . Find the excluded number
(A) 67
(B) 57
(C) 54
(D) 52
Answer: 57
Explanation: Excluded number =(45×5)-(42×4)=225-168=57
Q7. A shopkeeper marks an item 25 % above the cost price and offers a 10 % discount. If the item costs Rs. 1000 , what is the selling price
(A) Rs. 1225
(B) Rs. 1025
(C) Rs. 1325
(D) Rs. 1125
Answer: Rs. 1125
Explanation: Selling price = 1000 × 1.25 × 0.90 = Rs. 1125
Q8. If the difference between the compound interest and simple interest on a sum of P in 2 years at 5 % per annum is Rs. 2.50 , find the sum PR2
(A) Rs. 1100
(B) Rs. 1000
(C) Rs. 900
(D) Rs. 1100
Answer: Rs. 1000
Explanation:[SUM=PR 2(square)/100 2(square)] Sum(2.50) =(P×5×5)/(100×100)= Rs. 1000
Q9. A train 150 meters long passes a pole in 15 seconds. Find the speed of the train in km/h
(A) 36 km/ h
(B) 24 km/ h
(C) 48 km/ h
(D) 18 km/ h
Answer: 36 km/ h
Explanation: Speed of train = ( 150 / 15 ) × 18/5 ) = 36 km/ h
Q10. If the cost price of 15 articles is equal to the selling price of 12 articles, find the profit percentage
(A) 30%
(B) 20%
(C) 25%
(D) 15%
Answer: 25%
Explanation: Profit % = (( 15-12)/12 ) × 100 = 25%