SOLUTION: on a shop, two different types of sugar packets are sold, which costs 50 Rs each and 70 Rs each, respectively. If the shopkeeper sales 60 packages and have a total revenue of 3200.

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Question 830907: on a shop, two different types of sugar packets are sold, which costs 50 Rs each and 70 Rs each, respectively. If the shopkeeper sales 60 packages and have a total revenue of 3200. How many packets he sold of 50 Rs?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
x for how many of the 50 Rs priced
y for how many of the 70 Rs priced

x+y=60 according to the description;
50x+70y=3200 also described. Simplify this one to 5x+7y=320.

Solve the system for x and y.
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x+y=60
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5x+7y=320
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One way is multiply the package count equation by 5 and subtract from the revenue equation:

5x+7y-(5x+5y)=320-5*60
2y=20
y=10, meaning that x=50