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Math and Mental Ability Data Sufficiency

Use the table below to answer the question that follows.

The table shows Sabra's grades for a class. For her overall average, the test average counts twice as much as the quiz average, and the final exam counts twice as much as the test average. To find her overall average, Sabra uses the following expression.

(83 + 79 + 79 + 88 + 88 + 88 + 88) ÷ 7

Which of the following is another way to find her overall average?

83 + 2(79)/7 + 4(88)/7

83 + 0.2(79) + 0.4(88)

[83 + 2(79) + 4(88)] ÷ 0.7

[83 + 2(79) + 4(88)] × 1/7

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