SOLUTION: the price of a cinema ticket is 10000 for an adult and 7000 for a child 60 people attended the movie and paid 540000 find the number of children and adults that attended the movie

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Question 975044: the price of a cinema ticket is 10000 for an adult and 7000 for a child 60 people attended the movie and paid 540000 find the number of children and adults that attended the movie
Answer by josgarithmetic(39616) About Me  (Show Source):
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The price of a cinema ticket is 10000 for an adult and 7000 for a child. SIXTY people attended the movie and paid 540000. Find the number of children and adults that attended the movie.

Calling the money units, just "money", then assign some variables:
a adults, c children;
and form the described equations:
system%2810000a%2B7000c=540000%2Ca%2Bc=60%29

Simplify.
system%2810a%2B7c=540%2Ca%2Bc=60%29

Prepare to use Elimination, partway:
system%2810a%2B7c=540%2C7a%2B7c=420%29

You continue and finish.