exam Maths Puzzle Numerical Ability

a triangle has 3 sides 3x7 4x9 5x+6. find the expression that represents this perimeter

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exam Other Question

An oil tanker can be emptied by the main pump in 4 hours and by an auxiliary pump in 9 hours. If the main pump is started at 9 a.m., when should the auxiliary pump be started so that the tanker is emptied by noon? Please help me solve this using the quadratic formula:

2x^2+x=21