Tickets for the movies are $7 for adults and $4 for children. fourteen people paid a total of $68 for tickets. how many were adults and how many were children?

So let a=adults tickdts and c=children tickets
7a+4c=68
sincr it was 14 ppl,
let a+c=14
so, system of equations.
multiply a+c= 14 all by 4 to get
4a+4c=56 subtract this from the other
7a+4c=68
-3a=-12
a=4
plug in to either. for a
4+c=14
c=10
plug into other equation to check.
7(4)+4(10)=68
28+40=68

1. First we need to find cost price (cp) of 1 item

2. Secondly, we need to find selling price(sp) of 1 item

3.loss= cp - sp

4. loss% = loss/cp *100

Completly solved :

Cp of 12 items is ...₹ 86

Cp of one item is 86/12 = ₹ 7.17

Sp of 15 items is ₹ 43

Sp of 1 items is ₹ 43/15= ₹ 2.87

Loss = 7.17 - 2.87 = ₹4.3

Loss% =4.3/7.17 *100 = 59.97%