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Find the difference between the total number of ball point and fountain pens sold by shop A and the total number of ball point pens sold by shop D.
230
250
340
190
None of the above
230
Focus on the data points for A (diamond 400, triangle 350) and D (diamond 520) directly from the graph to avoid unnecessary calculations.
From the line graph, for Shop A: Ball Point Pens = 400, Fountain Pens = 350. For Shop D: Ball Point Pens = 520.
Difference=тИг(Ball┬аPointAтАЛ+FountainAтАЛ)тИТBall┬аPointDтАЛтИг
Focus on the data points for A (diamond 400, triangle 350) and D (diamond 520) directly from the graph to avoid unnecessary calculations.
Students often accidentally sum all pens for Shop D or misidentify the markers for ball point (diamond) vs fountain (triangle) pens.
Extract Data for Shop A
From the legend and the graph for Shop A, the number of ball point pens is 400 and the number of fountain pens is 350.
SumAтАЛ=400+350=750
Extract Data for Shop D
From the graph for Shop D, the number of ball point pens is located at 520.
Ball┬аPointDтАЛ=520
Calculate Difference
Subtract the total number of ball point pens in Shop D from the calculated total for Shop A.
750тИТ520=230
A is correct because the sum of ball point and fountain pens in shop A is 750 and the difference from 520 (shop D ball point pens) is 230.
Always map the legend symbols to the y-axis precisely; line graphs often have overlapping points that require careful visual alignment.
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