Posted by **christina** on Monday, July 13, 2009 at 5:40pm.

Admission to a museum is $10 for each adult and $5 for each child. If a group oh 30 people pays a total of $175 in admission how many adults are in the group?

- MATH -
**Marth**, Monday, July 13, 2009 at 5:55pm
let x = number of adults

let y = number of children

There are 30 people in the group, so x+y = 30

The total cost is $175, so 10x + 5y = 175

10x + 5y = 175

Divide by 5:

2x + y = 35

Now subtract the two equations:

2x + y = 35

x + y = 30

x = 5

Substitute x into one of the equations to find y.

5 + y = 30

y = 25

Now plug both values into the other equation to check your work.

2(5) + 25 = 35

10 + 25 = 35

35 = 35

Your answers are correct.

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