exam Maths Puzzle Numerical Ability

diana bought a football helmet that originally cost $39 the helmet was on sale at 15% off find the discount

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Please help me find all real soultions for this equation.
{{2y^2=15+y}}}

The teacher said there are two answers which are 3 and -5/2. I can not get to either of these answers.

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a cotographer is revising a map that will convert all map distances to millimeter.how will he express the distancebetween two places if they are 43 dm apart?