# Aptitude [ST Microelectronics Placement]: Sample Questions 12 - 14 of 40

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## Question 12

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### Write in Short

There is a pipe having diameter 6 mm, then how many pipes having 1 mm diameter will be needed to provide the same amount of water?

### Explanation

As we all know pipe is cylindrical in shape.

Volume of pipe (cylinder) , V = r2h

Where, r = radius of the circle and h = height of cylinder

Here, for r1 = 6 mm,

V1 = 36 h mm3

And for r2 = 1 mm,

V2 = 1πh mm3

Number of required pipes = V1 / V2

= = 36

So, number of pipes required to provide the same amount of water = 36

## Question 13

Aptitude
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### Write in Short

Sister՚s age is twice than that of the brother. If the brother՚s age is six, what is the sister՚s age after two years?

### Explanation

• At present,
• Brother՚s age, b = 6 years
• Sister՚s age, s = 2b = 12 years
• After 2 years,
• Brother՚s age, = b + 2 = 8 years
• Sister՚s age = s + 2 = 14 years
• After two years sister՚s age will be 14 years.

Aptitude
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