Discussion
In the group of women aged 25 - 34, 25% were from the age group 27 - 29. What is the number of women aged 27 years or above who had babies in that hospital last year ?
Answer: D
The number aged 27 or above is 325.
The 25 - 34 group has 350 + 150 = 500 women, and 25% of them, 125, are aged 27 - 29. Women aged 27 or above are those aged 27 - 29, plus everyone in the 30 - 34 and 35 - 40 groups:
\[ 125 + 150 + 50 = 325 \]
550 counts the whole of the 25 - 34 group plus the 35 - 40 group, instead of only those aged 27 and above. 200 counts only the women aged 30 and above and leaves out the 27 - 29 group. 425 does not match any correct grouping of the ages.
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