3.5a+2.5a=100

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3.5a+2.5a=1003.5a+2.5a=1003.5a+2.5a=100a(3.5+2.5)=1006a=100a=50/33.5a+2.5a=1006a=100a=50/3

3.5a+2.5a=100
3.5a+2.5a=100

3.5a+2.5a=100
a(3.5+2.5)=100
6a=100
a=50/3

3.5a+2.5a=100
6a=100
a=50/3