exam Maths Puzzle Numerical Ability

use elimination to solve each system of equations

6s+5t=1
6s-5t=11

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exam Other Question

Given square ABCD with AB= 2x+1 and CD= 5x-19 what is the perimeter of the square? A plane takes 5 hours to fly from LosAngeles to Honolulu and 4.09 hours to return from Honolulu to LA. I f the wind velocity is 50mph from the west on both trips, what is the airspeed of the plane? ( Airspeed is speed of plane in still air)