exam Maths Puzzle Numerical Ability

what are the steps to doing this equation:
3y+2y-y=20

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exam Other Question

R=A(T2-T1)/H , FOR T2 (THERMAL RESISTANCE) A bridge is built in the shape of a parabolic arch. The bridge has a span of 120 feet and a maximum height of 25 feet. Choose a suitable rectangular coordinate system and find the height of the arch at distances of 10, 30 and 50 feet from the center.