exam Maths Puzzle Numerical Ability

the sum of two numbers is 90. The larger number is twice he smaller number. What are the two numbers?

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exam Other Question

I am having troubles with solving equations with logs.... this is the one im stuck on, 4^1-2x=32 (Four to the power of 1 minus 2x equals 32) how to solve x2+y2+6x-4y12=0