SSC CGL (SSC Combined Graduate Level) Mathematics: Questions 407  412 of 425
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Question number: 407
» Surds
Question
The square root of is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 408
» Average
Question
In a school with 1800 students, the average age of boys is 20 years and that of the girls is 19 years and 11 months. If the average age of the school is 19 years and 7 months, then the number of the girls in the school is
Choices
Choice (4)  Response  

a.  100 

b.  600 

c.  800 

d.  900 

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. 

