ISRO Assistant Paper 2012 – Arithmetic

Indian Space Research Organisation Assistant/ Junior Personal Assistant Paper 2012

The average of 5 numbers is 27. If one number is excluded, the average becomes 25. The excluded number is
(a) 25
(b) 27
(c) 30
(d) 35

A village has 64,000 inhabitants. If the population increases at the rate of 2.5% per annum, then the number of inhabitants at the end of THREE years will be
(a) 68911
(b) 68921
(c) 69200
(d) 70000

A and B can do a piece of work in 72 days; B and C can do it in 120days; A and C can do it in 90 days. In what time can A alone do it?
(a) 80 dyas
(b) 100 days
(c) 120 days
(d) 150 days

If the side of square is increased by 5 cm, the area increased by 165 sq.cm. The side of the square is
(a) 12 cm
(b) 13 cm
(c) 14 cm
(d) 15 cm

The smallest number which on adding 17 to it is exactly divisible by 32, 48 and 72
(a) 290
(b) 281
(c) 292
(d) 271

In an examination 52% candidate failed in English and 42% failed in Mathematics. If 17% candidates failed in both English and Mathematics. What percentage of candidates passed in both the subjects?
(a) 18%
(b) 21%
(c) 23%
(d) 25%

A sum of Rs. 9000 is to be distributed among A, B and C in the ratio of 4:5:6. What will be the difference between A’s and C’s Shares?
(a) Rs. 600
(b) Rs. 1000
(c) Rs. 900
(d) Rs. 1200

A trader sold 20% of his stock at 10% profit and 50% of the remainder of his stock at 10% loss. What should be the rate of profit for the sale of the remainder of his stock in order that the trader may make an overall profit of 5% over his entire stock?
(a) 17.5%
(b) 15%
(c) 20%
(d) 25%

Which of the following values is equivalent to the number 42?
(a) 42/10
(b) 43/6
(c) 0.42
(d) 4200%

A car takes 5 hours to cover a distance of 300 km. How much should the speed in km/hr be maintained to cover the same distance 4/5th of the previous time.
(a) 70 km/hr
(b) 65 km/hr
(c) 75 km/hr
(d) 60 km/hr