TCS Company Numerical Ability Ratio and Proportion

The ratio of boys to girls is 6:4.60% of the boys and 40% of girls take lunch in the canteen.What % of class takes lunch?

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TCS Other Question

What is the distance in cm between two parallel chords of lengths 32cm and 24 cm in a circle of radius 20 cm
a)4 or 28
b)3or 21
c)2 or 14
d)1 or 7
Which of the following set of numbers has the highest Standard deviation?
a)1,0,1,0,1,0 b) -1, -1, -1, -1, -1, -1
c)1,1,1,1,1,1 d) -1,1,-1, 1,-1, 1