book Maths Puzzle Numerical Ability

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

5/7=?/98

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book Other Question

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 What is the formula to figure the percentage one number represent over another? For example if I sold $1,613 last year, and will sell $1,804 this year, what is the % increase?