exam Maths Puzzle Numerical Ability

Does anyone know:

Is 12 a solution to the equation 19 - x = 7?

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exam Other Question

Perform the indicated operation. Simplify if possible.

x/2 + 8x/9 = x/18 In 2000,there were 97.4 million households w/ telephones.The ppl in these households made 544 billion local calls and 97 billion long distance calls.
a.write each # in scientific