exam Maths Puzzle Numerical Ability

The sum of two numbers is 20. Twice one number is 4 more than four times the other. Find the numbers.

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exam Other Question

The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way?

900 Graph the equation 3x - y = -1.