【官方】SAT数学每日一题附答案和解析(2018年2月7日)

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【官方】SAT 数学每日一题附答案和解析 ( 2018 年 2 月 7 日 )

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每日一练:数学

Math: Calculator Permitted

Read the following question and then select the best answer.

Three electricity plans are available in a certain county. The monthly usage and corresponding charges for that usage for three households, each using a different plan is shown below. Which plan, if any, has the lowest cost per kilowatt-hour left parenthesis text kWh end text right parenthesis?


Plan A

Plan B
Plan C

Kilowatts used

930 kWh

900 kWh
810 kWh

Monthly charge

$106.50

$110.70
$115.20

Select an Answer

A.Plan A

B.Plan B

C.Plan C

D.The plans all cost the same amount per kilowatt-hour.

答案及解析:A

EXPLANATION

For Plan A: $ 106.50/ 930 kWh ≈ $0.11per kWh

For Plan B: $ 110.70/ 900 kWh ≈ $0.12per kWh

For Plan C: $ 115.20/ 810 kWh ≈ $0.14per kWh

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每日一练:数学

Math: Calculator Permitted

Read the following question and then select the best answer.

Three electricity plans are available in a certain county. The monthly usage and corresponding charges for that usage for three households, each using a different plan is shown below. Which plan, if any, has the lowest cost per kilowatt-hour left parenthesis text kWh end text right parenthesis?


Plan A

Plan B
Plan C

Kilowatts used

930 kWh

900 kWh
810 kWh

Monthly charge

$106.50

$110.70
$115.20

Select an Answer

A.Plan A

B.Plan B

C.Plan C

D.The plans all cost the same amount per kilowatt-hour.

答案及解析:A

EXPLANATION

For Plan A: $ 106.50/ 930 kWh ≈ $0.11per kWh

For Plan B: $ 110.70/ 900 kWh ≈ $0.12per kWh

For Plan C: $ 115.20/ 810 kWh ≈ $0.14per kWh

关注微信公众号【留学战书】:

人手一本经典 SAT 考试用书 在线免费阅读

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