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As shown in the below diagram, a person starts from the centre O of a circular path AB walks along the line indicated by arrows and returns to the same point. If the radius OA=OB=100 m, what is the total distance walked to the nearest metres?

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Important Questions on General Mental Ability (Quantitative Aptitude /Reasoning)

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A circle is drawn inside a square of length 4 units as shown in the figure given below. What is the area of the shaded portion?

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If the ratio of X to Y is 34 and the ratio of Y to Z is 1213 then the value of X to Z is
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The sum of the base and altitude of a triangle is 30 cm. What is the maximum possible area of such a triangle?    
HARD
Defence
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In the diagram (not to scale) given above, the value of x is

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5 person can weave 160 mats in 8 days. How many mats will 8 person weave in 6 days?
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Two cars are moving in the same direction with a speed of 45 km/h and a distance of 10 km  separates them. If a car coming from the opposite direction meets these two cars at an interval of 6 min, its speed should be 
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Defence
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The least integer which should be multiplied to 588 to make it a perfect square?
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By selling an article at Rs.270, a man losses 10%. If he would sell it at Rs.360, his gain percent is