The speed of swimmer along the flow of river is 40 kilometre per hour and against the flow of river is 22 kilometre per hour what would be the speed of swimmer in still water?

Speed of swimmer (x)=(1)x[downstream speed+upstream speed]/2

X=(40+22)/2=31

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In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options. Q1F, S2E, U6D, W21C, ?

The first letter of each term is moved two steps forward and the last letter is moved one steps backward to obtain the corresponding letters of the next term. The number series runs as follows :

1 x 1 + 1 = 2,

2 x 2 + 2 = 6,

6 x 3 + 3 = 21,

21 x 4 + 4 = 88.

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Clothing store sells T-shirts in only three colours: red, blue and green full . The colour are in the ratio of 3 to 4 to 5 . If the store has 20 blue T-shirts ,how many T shirts does it have ?

Ratio of shirts red: blue :green

3:4:5

if store have 20 blue T-shirts

20/4= 5

3Ã—5:4Ã—5:5Ã—5

15:20:25

Then total t-shirts are

15 + 20 + 25 = 60

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In following questions, one term in number series is incorrect.

Find out the incorrect number 15, 16, 22, 29, 45, 70

Find out the incorrect number 15, 16, 22, 29, 45, 70

The pettern is + 1, + 4, + 9, + 16, + 25,.... i.e. + 1

So, 22 is wrong and must be replaced by (16 + 4) i.e. 20..