1)There are some bees in a garden.1/5th of them went to a particular flower,1/3rd went to another flower,3 times the difference of the above two went to third flower and one was remaining and it was roaming around. How many bees were there? (3 marks)
a)12 b)4 c)15 d)12
Ans:(c)
Explanation:
1/5 of the bees went to one place.
1/3 of the bees went to another place.
3 times difference went to third place=3((1/3)-(1/5))
=2/5
So 1/5 + 1/3 + 2/5 =14/15
Total no of bees went to search the flower was 14/15
One is remaning
So
14/15 + 1/x =1
1/x=1 - 14/15
X=15
Ans:=15
2)A man drives with constant speed and after some time he sees a milestone with 2-digits and then he travels for an hr and sees the same 2 digits in reverse order and then after an hour he sees that the
milestone has the same 2 digits with a 0 between them.so whats the man speed?
a)45km/h b)35km/h c)20km/h
Ans:a)
Explanation:
Intially he see two digit xy
Then he see reverse order yx
Then he see 0 between x0y
Two digit no starting with 10 so
Xy yx x0y
10---> 10 01 100 xy-yx not equal to x0y-yx
11---> 11 11 101 xy-yx not equal to x0y-yx
12---> 12 21 102 xy-yx not equal to x0y-yx
13---> 13 31 103 xy-yx not equal to x0y-yx
14---> 14 41 104 xy-yx not equal to x0y-yx
15---> 15 51 105 xy-yx not equal to x0y-yx
16---> 16 61 106 xy-yx equal to x0y-yx à45
So the speed is 45km/h.Because when time=1 means speed=distance
3)If 10 be added to 4 times a certain number, the result is 10 less than 5 times the number.what is the number?
a)15 b)20 c)25 d)30
Ans:(b)
Explanation:
10 + 4x = 5x - 10
X=20
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