NRA CGL (National Recruitment AgencyCombined Graduate Level) Mathematics: Questions 409  413 of 425
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Question number: 409
» Average
Question
In a school with 900 students, the average age of boys is 12 years and that of the girls is 11 years and 6 months. If the average age of the school is 11 years and 9 months, then the number of the girls in the school is
Choices
Choice (4)  Response  

a.  390  
b.  450  
c.  760  
d.  460 
Question number: 410
Question
A and B working together take 9 and 25 less days than A alone and B alone respectively to do a work. The number of days taken by A and B working together to do the work is
Choices
Choice (4)  Response  

a.  18  
b.  17  
c.  16  
d.  15 
Question number: 411
Question
A and B working together take 12 and 27 less days than A alone and B alone respectively to do a work. The number of days taken by A and B working together to do the work is
Choices
Choice (4)  Response  

a.  17  
b.  15  
c.  16  
d.  18 
Question number: 412
» Average
Question
The average marks of 30 students in a test is 60. Later it is found that three marks 55,65& 50 were wrongly entered as 53,68 & 59. The average marks after mistakes were rectified is
Choices
Choice (4)  Response  

a.  95.67  
b.  59.67  
c. 
 
d. 

Question number: 413
Question
A person covers a distance from his home to office in 30 minutes if he drives his car with the speed of 50 km/hr. find the speed of his car in return journey, if the duration of return journey increases by 20 minutes.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
