exam Maths Puzzle Numerical Ability

My daughter gave an answer to a problem as follows:
1/4 x + Y = 2 1/2
The prof. told her she has to convert it all to numbers
Help?

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1)Find an equation in slope-intercept form passing through the points (-6.2,18.1) and (-3.4,18.1). If Leah is 6 years older than her sister, Sue,and John is 5 years than Leah, and the total of their ages is 41. Then how old is Sue?