exam Maths Puzzle Numerical Ability

Find the Fahrenheit temperature of hot tap water at 70 degree C by solving the equation:

70= 5/9 (F-32)

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exam Other Question

Manley's tarctor is just as fast as Caledonia's. It takes Manley 1 hour more than it takes Caledonia to drive to town. If Manley is 20 mi from town and Caledonia is 15 mi from tow 2 - u = 3(x-y) +6
x + y = 50 + z + u
x - y + z - u = 42