SOLUTION: A shop sold pens for 0.70 each and rulers for 0.50 each. Mary bought some pens and rulers. She bought 8 more rulers than pens but she spent $1.40 more on the pens than on the ruler

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Question 1151914: A shop sold pens for 0.70 each and rulers for 0.50 each. Mary bought some pens and rulers. She bought 8 more rulers than pens but she spent $1.40 more on the pens than on the rulers. How many rulers did she buy?
Can you please help with this question Thank a lot
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
p pens and r rulers

She bought 8 more rulers than pens
r-p=8

she spent $1.40 more on the pens than on the rulers.
0.7p-0.5r=1.4

Question asks for how many rulers, r.
Use the first equation as p=r-8 and use this in the second equation, and you have:
0.7%28r-8%29-0.5r=1.4
Now just simplify and solve.


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highlight%28r=35%29