Book Maths Puzzle Algebra

Your in a closed circuit race; 1/5 of the bikers are in front of you and 5/6 of the bikers are in back of you; what the is number of bikers are in the race?

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Book Other Question

bmiof 27 height of 1.81m using the formula BMI where w is weight and in kilograms and h is height in meters construct an equation for w and solve it to find the weight Trying to solve the following:
x3-12x2+44x-48=0


(thats x cubed, 12 x square, 44x, -48)


Thanks