Let c = number of children
Let a = number of adults
5a + 2c > 3350
In a triangle, the total angle is 180 degrees. A straight line is always 180 degrees. With this in mind, the following can be obtained:

These are simultaneous equations.

Answer: 64 cups
Step-by-step explanation:
Each gallon has 16 cups so you multiply 16 by 4 because there are 4 gallons and you get 64. Hope that helped. :)
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8160 dived by 85 equals 96, 2880 divided by 30 equals 96, therefore she can make 96 necklaces