Discussion
What is the number of apples plucked on day 6 ?
Answer: B
On day 6 Shakuntala plucked 35 apples.
Combine a five-day sum with a three-day sum that starts on the same day:
\[ \begin{aligned} d_7 + d_8 &= (d_4 + \dots + d_8) - (d_4 + d_5 + d_6) \\ &= 270 - 145 = 125 \\ d_6 &= (d_6 + d_7 + d_8) - 125 \\ &= 160 - 125 = 35 \end{aligned} \]
The charts are therefore enough, so 'Cannot be determined' is wrong. 45 and 25 are the counts for other days (day 10 and day 2) when every day is worked out the same way.
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