21)If CP of 5 mangoes is equal to SP of 4 mangoes, then what will be gain percentage?
a) 20
b) 16
c) 25
d) 10
22) What is the rate of interest, when the PW of Rs 1245 due 15 months hence is Rs 1200 ?
a) 3%
b) 2%
c) 4%
d) 5%
23) If x2 + y2 – 4x – 4y + 8= 0, then the value of x – y is
a) 4
b) – 4
c) 0
d) 8
24) If a* b= 2a – 3b + ab, then 3* 5* + 5 * 3 is equal to
a) 22
b) 24
c) 26
d) 28
25) The discount series 10%, 20%, 40% is equivalent to a single discount of
a) 50%
b) 56.8%
c) 60%
d) 62.28%
26) The mean of five numbers is 18. If one n umber is excluded, their mean is 16. The excluded number is
a) 25
b) 26
c) 27
d) 30
27) 8 men can dig a pit in 20 days. If a man works half as much again as a boy, then 4 men and 9 boys can dig a similar pit in
a) 10 days
b) 12 days
c) 15 days
d) 16 days
28) Find the largest common divisor of 102 and 1170
a) 10
b) 7
c) 6
d) 8
29) The smallest 3-digit prime number is
a) 103
b) 107
c) 109
d) None of these
30) sin2 20o + sin2 70o – tan2 45o =?
a)0
b) 2
c) 1
d) ½