exam Maths Puzzle Numerical Ability

5ay+b=80ay-c; solve for y
**assume none of the coeffiecnts or variables are 0*
thanks !!

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In how many zeroes does 127! end? (Note: 127! means 127(126)(125)...(1)). in a triangle the measure of the second angle is 4 times the measure of the first angle. the measure of the third angle is equal to the sum of the measures of the first two angles. find the number of degrees in each angle of the triangle