Aptitude - Arithmetical Ability

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19.

The fourth proportional to 5, 8, 15 is:                        
A. 18 B. 19
C. 20 D. 24



20.

If 24 men working for 12 hrs a day can do a work in 16 days, in how many days can 8 men working 6 hrs a day do it?                        
A. 46 days. B. 66 days.
C. 80 days. D. 96 days.



21.

Two number are in the ratio 3 : 5. If 9 is subtracted from each, the new numbers are in the ratio 12 : 23. The smaller number is:                        
A. 27 B. 33
C. 49 D. 55




22.

In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there?                        
A. 50 B. 100
C. 150 D. 200



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