Joanna went school supply shopping. she spent $26.75 on notebooks and pencils. notebooks cost $1.85 each and pencils cost $1.38 each. she bought a total of 17 notebooks and pencils. how many of each did she buy?

a. 12 notebooks; 5 pencils
b. 7 notebooks; 10 pencils
c. 10 notebooks; 7 pencils
d. 5 notebooks; 12 pencils

the solution is 12x-6y

we can set up an equation to find the girls' ages. the equation is         28=0.5x-5+x. (comment if you need me to explain how i got this equation.) so, you add x and 0.5x to get 1.5x and add 5 to each side. your new equation is 33=1.5x. now divide both sides of the equation by 1.5 to get 22=x. because x is mary's age, to find jasmine's age we subtract mary's age from 28. we find that mary is 22 years old and jasmine is 6 years old.