Question 325183
A swimming pool 100 metres long and 40 metres wide is 1 metre deep at the shallow end and 5 metre at the deep end. Find the volume (in cubic metres) of water contained in the pool.
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Since you didn't specify otherwise, I'll assume the bottom is flat (not level, but flat)
That makes the average depth 3 meters (1+5)/2
Volume = 100*40*3 = 12000 cubic meters
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That's a large pool, 330 feet long.  Have you seen it?