Exam Maths Puzzle Blood Relations

how would you answer5(c-b)+10

a=5 b=3 c=9

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Exam Other Question

We have a rectangle where 2x + 2y = 45, and x = 2/3y, solve for x (or Y). How do you solve this? Can linear equations have decimals for example: x-0.5=0 is this a linear equation.