exam Maths Puzzle Numerical Ability

Yuri has a board that is 98 inches long. He wishes to cut the board into two pieces so that the pieces will be 10 inches longer that the other. What should the lenght of each piece?

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exam Other Question

True or false, the following polar coordinates are multiple representations of the same point: (-5, 7pi/4)(-5, 5pi/4)

i say false but i really dont know....i also dont know if this should be posted somewhere else If the amount of mercury in a polluted lake is 0.40 HG/mL, what is the total mass of mercury in kilograms in the lake. The lake has a surface area of 25 square miles and an average