Algebra

# Setting Up Equations

On a 2-day roadtrip, Janet drove $$210$$ miles the first day, and $$S$$ miles on the second day. She drove a total of $$570$$ miles.

Which of the following mathematical statements expresses the above?

For his exercise, James runs $$D$$ miles every weekday, $$E$$ miles on Saturday, and $$E$$ miles on Sunday. He runs a total of 27 miles each week.

Which of the following mathematical statements represents the above?

Alex and Bella have 24 sweets in total. Bella has 6 sweets more than Alex.

If $$A$$ represents Alex's sweets, and $$B$$ represents Bella's, which of the following statements represents the above relationship?

John is 3 years older than Mary, and Mary is 9 years older than Zack.

Let John's age be denoted by $$J$$, Mary's age be denoted by $$M$$ and Zack's age be denoted by $$Z.$$

Which of the following statements represents their age?

Elle's cellphone was fully charged when she got a call from her friend. She used $$x$$% of the battery while she was on the phone, and her cellphone is 87% charged now.

Which of the following mathematical statements describes the above?

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