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Let the number of biology, chemistry and physics books be B, C and P. B+C+P =300×3=900 B+C+P=900 … (1) Biology books =150+Average number of (C and P) B=150+(C+P)/2 2B=300+C+P 2B-C-P=300 … (2) Physics books =Average of (B+C)/2 -150 P=B+C)/2 -150 2P=B+C-300 B+C-2P=300 … (3) Adding Equation (1) and (3) and subtracting (2) ... (B+C+P) + B+C-2P -2B+C+P=900+300-300 3C=900 C=300.
Two trains, 'A' and 'B', are heading towards each other from opposite ends of a 360-meter bridge. Train 'A' travels at a speed of 15 m/s, and train 'B' ...
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800 metres long train crosses a man who is moving in the same direction with a certain speed, in 40 seconds. If the same train can cross a tree in 20 se...
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A man running at the speed of 5 kmph was over taken by the train moving with the speed of 41 kmph in 20 seconds. Find the length of train.
A train can cross a pole in 18 seconds. While if the train increased its speed by 75% then time taken by it to cross 444 metres long platform is 42 seco...
1600 metres long train crosses a man who is moving in the same direction with a certain speed in 25 seconds. If the same train can cross a pole in 20 se...
350 metre long train ‘A’ is running with a speed of 43.2 km/hr. Train ‘B’ which is 387 metre long is running with a speed of 90 km/h in opposite...
A train crosses a platform in 48 seconds travelling with a speed of 120 km/hr. If the length of the train be 600 metres, then the length (in metres) of ...