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The marks obtained in Mathematics and Chemistry exceed the marks obtained in Physics and Social Science by
Total angle made by maths and chemistry in pie chart is 160.
Hence their total share will be $$\frac{810}{360} \times 160 $$ = 360
And total share of physics and social science will be 140.
Hence their total share will be $$\frac{810}{360} \times 140$$ = 315
Difference is 360-315=45
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