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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 ____

  1. A. 60 millimetres.Correct
  2. B. 20 millimetres.
  3. C. 80 millimetres.
  4. 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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