book Maths Puzzle Numerical Ability

I am very confused as to how to Solve each system by the additional method. Can someone help me understand this and solve it please?

17.) x + y = 48
12x + 14y = 628

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book Other Question

Can someone help me with this problem?

A baseball team wins 11 of its 25 games with no ties. How do I write the ratio of wins to losses?

Thanks,
Sher
Buildup each fraction or whole number so that it is equivalent to the fraction with the indicated denominator

5/7=?/98