Information and IdeasMediumReading a change from a table
Information and Ideas practice question
Average monthly rainfall recorded at a weather station, in millimetres:
January: 80
February: 60
March: 40
April: 20
Which choice most accurately completes the statement based on the data? From January to April, average monthly rainfall decreased by ____
- A. 60 millimetres.Correct
- B. 20 millimetres.
- C. 80 millimetres.
- D. 100 millimetres.
Answer: A. 60 millimetres.
January's 80 minus April's 20 is 60 millimetres.
Why the other answers are wrong
- B. 20 millimetres.
- 20 is the drop from one month to the NEXT, and also April's total. January to April is three such drops: 60.
- C. 80 millimetres.
- 80 is January's rainfall, the starting value, not the decrease.
- D. 100 millimetres.
- 100 is 80 + 20, the two values added rather than subtracted.
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