#### CDS Exam ELEMENTARY MATHEMATICS Study Material

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b) 20

c) 25

d) 30

b) Rs. 324

c) Rs. 238

d) Rs. 245

b) 2 : 1

c) 1 :3

d) 4 :1

b) 10.5 days

c) 11. days

d) 12.5 days

b) 18

c) 20

d) 25

b) 12

c) 18

d) 9

b) 50

c) 60

d) 70

therefore time taken to read 100 pages =100/60=1.66h

similarly,in evening time taken = 100/40=2.5h

now,average rate of evening = total pages/time taken = 100+100/1.66+2.5

=200/4.16=48 pages/h

b) 8 days

c) 9 days

d) 12 days

b) 18 days

c) 24 days

d) 30 days

b) 12

c) 15

d) 16

= ab/a + b =20* 30/50 =12 days