A student got twice as many sums wrong as he got right. If he attempted 48 sums in all, how many did he solve correctly ?

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SSC CGL(Combined Graduate Level) Tier1 Test
SSC CGL Tier1 General Intelligence And Reasoning
Q:1

Explanation:

Suppose the boy got x sums right and 2x sums wrong.
Then, x + 2x = 48 3x = 48 x = 16.

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David gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross ?

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