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a+4b+a+5b=42
2a+9b=42
s11=11/2 × (a+a+10b)
11/2×(2a+10b)
11×(a+5b)
a=(42-9b):2
11×((42-9b)÷2+5b)
11×(42-9b+10b)÷2
11×(42+b)÷2
5,5(42+b)
tidak dapat dicari lagi
mungkin salah soal
u5+u6+u7
3a+4b+5b+6b=42
3a+15b=42
a+5b=14
s11=11×(a+5b)
11×14=154