book Maths Puzzle Numerical Ability

what is the formula to find out the perimeter of a trapizium?

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book Other Question

how many liters of water must be added to 8 liters of a 40 percent acid solution to obtain a 10 percent acid solution? Just a note from my part...since I don't know how to make in the keyboard a non- dotted
line that's why I had to put the dotted one between the middle of the problem but it is sup