book Maths Puzzle Numerical Ability

If twice a certian number is increased by 3, the result is 8 less than threes time a number. Find the number

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book Other Question

The only quadrant that contains no points of the graph of y = x2 - 8x + 18 is quadrant An aquarium is 32 inches long, 15 inches wide and 24 inches high. the volume of water in the aquarium is 10,560 cubic inches. How deep is the water?

I know the formula for volume V=lwh but how do I set up and solve this problem?