SSC CGL Tier-2 4th-September-2011 Maths

Successive discounts of 10%, 20% will be equivalent to a single discount is

A retailer offers the following discount scheme for buyers on an article
I.Two successive discounts of 10%.
II.A discount of 12% follows by a discount of 8%.
III.Successive discounts of 15% and 5%
IV. A discount of 20%.

A mixture contains 80% acid and rest water. Part of the mixture that should be removed and replaced by the same amount of water to make the ratio of acid and water 4 : 3 is

An employer reduces the number of his employees in the ration 9 : 8 and increases their wages in the ration 14 :15. If the original wage was Rs, 18,900, find the ratio in which the wage bill is decreased

The batting average for 40 innings of a cricketer is 50 runs. His highest score exceeds his lowest score by 172 runs. If these two innings are excluded, the average of the remaining 38 innings is 48 runs. The highest score of the player is

A and B are two alloys of gold and copper prepared by mixing metals in the ratio 7 :2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, the ratio of gold and copper in C will be

In a laboratory, two bottles contain mixture of acid and water in the ratio 2 : 5 in the first bottle and 7 : 3 in the second. The ratio in which the contents of these two bottles be mixed such that the new mixture has acid and water in the ratio 2:3 is

The average of the three numbers is 154. The first number is twice the second and the second number is twice the third. The first number is

The average salary of all the staff in an office of a corporate house is Rs. 5,000. The average salary of the officers is Rs. 14,000 and that of the rest is Rs. 4,000. If the total number of staff is 500, the number of officers is

The average marks of 40 students in an English exam is 72. Later it is found that three marks 64, 62 and 84 were wrongly entered as 68, 65 and 73. The average after mistakes were rectified is