The information you would need to create a two-variable equation is how much was her allowance and how much money did she have. Also you would need to know how many arcade games she played and how much each one cost and how many times she rode the Ferris wheel and how much each ride cost.
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8 +7m=6m (combine like terms)
8=-m ( subtract 7m on both sides)
m=8 (divide by -1)
5=-1+2n ( subtract 2n on both sides)
6=2n (add 1 on both sides)
3=n (divide by 2 on both sides)
1 out of 10 can be written as a fraction/ 1/10
Multiply total students by the fraction:
360 x 1/10 = 360/10 = 36
There are 36 left handed students.
2 divided by 18 will equal 9
so just multiply that by the minutes (3)
9×3=27 minutes