exam Maths Puzzle Numerical Ability

In the diagram <G and <H are complementry. <G is (2x+10) and <H is (x+20). What is the measurement of <G

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A bicyclist rode into the country for 5h. In returning, her speed was 5 mi/h faster and the trip took 4h longer. What was his speed each way? find solution set x^3 + x<6-4x^2