Is 4.2: 1.5 proportional to 12: 5

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Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points