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Angle covered by minute hand in 20 min

Therefore the angles between the hands is
130° ­ 120° = 10°

Answer. c

7. A hunter kills half of the birds on a particular tree after some time he comes back and kills one­third of the remaining birds, if 10 birds are left in the

end then what was the original number of birds on the tree.

a. 10
b. 20
c. 30
d. 40
Solution. Let x be the original number of birds

Birds left after the hunter killed half of them = x/2

Bird left after killing one­third of the remaining =

Now x/3 = 10
Hence, x = 30
Answer. c

8. A hunter kills half and one birds of the total which were sitting on a particular tree after some time he comes back and again kills half and one birds of

the remaining birds. If 3 birds are left on the tree then what was the original number of birds on the tree.

a. 9
b. 14
c. 18

d. 20
Solution. Let x be the original number of birds on the tree

Birds left after the hunter kills half and one of the total birds

Birds left after the hunter again kills half and one of the remaining

Birds left at the end = 3
Hence

Hence the initial numbers of birds on the tree were 18.
Answer. c