book Maths Puzzle Numerical Ability

-6y+15=3(y-1)

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book Other Question

explain what is wrong with the reasoning in the statement: since 20 is the opposite of -20, then 20 degrees ferhinent must be very hot, because -20 degrees celiuis is very cold. can you give me the formula to work out the hypotenuse when I only know 1 length & the three angles of the triangle