Subject S1 Marks Analysis

The question requires comparing the combined marks of specific students in subject S1.

• Marks of Student B in S1 = 120
• Marks of Student C in S1 = 128
• Marks of Student A in S1 = 80
• Marks of Student D in S1 = 84
• Marks of Student E in S1 = 64

Combined Marks Calculation

First, calculate the total marks scored by students B and C together in subject S1:

$Marks_{B+C} = Marks_B + Marks_C = 120 + 128 = 248$

Next, calculate the total marks scored by students A, D, and E together in subject S1:

$Marks_{A+D+E} = Marks_A + Marks_D + Marks_E = 80 + 84 + 64 = 228$

Percentage Increase Calculation

To find how much more the marks of B and C combined are than A, D, and E combined, calculate the difference:

$Difference = Marks_{B+C} - Marks_{A+D+E} = 248 - 228 = 20$

Now, calculate the percentage increase relative to the marks of A, D, and E combined:

$Percentage Increase = \(\frac{\text{Difference}}{Marks_{A+D+E}} \times 100\)$

$Percentage Increase = \(\frac{20}{228} \times 100\)$

$Percentage Increase \(\approx 0.087719 \times 100\)$

$Percentage Increase \(\approx 8.77\%$

Conclusion

The marks scored by student B and student C together in subject S1 are approximately 8.77% more than the marks scored by student A, student D, and student E together in the same subject.