SOLUTION: Hi.. My son is in fifth grade and has this problem we can't solve. Leslie has 10 gift cards . Some are square in shape and some are triangular . The cards have 34 side

Question 953068: Hi.. My son is in fifth grade and has this problem we can't solve. Leslie has 10 gift cards . Some are square in shape and some are triangular . The cards have 34 sides altogether. How many square cards does she have?
Thank you for your help!
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

Leslie has gift cards .
Some are in shape => these have sides
and some are => these have sides

let be and be :
if Leslie has gift cards, means ....eq.1
if the cards have sides altogether, means ...eq.2
now we have a system to solve:
....eq.1
...eq.2
----------------------------
....eq.1...solve for
.........substitute in eq.2
...eq.2..solve for

now find :

so, Leslie has square cards

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