exam Maths Puzzle Numerical Ability

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50: In elliptic or spherical geometry, there can be _____ right angle(s) in a triangle.

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please help me solve this equation:a mountain climber is scaling a 400-foot cliff.The climber starts at the bottom at t=0 and climbs at a constant rate of 124 feet per hour.use the 5a+5b divided by 5a+10