Answer:
5b: 14 feet per second
4: 25 students per classroom
5a: 1 Cups of flour per Cups of sugar
Step-by-step explanation:
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E3, E6, E11, E7: no solution
E1, E12 : 1 solution
E2, E8, E10 : infinite solutions
2/3
0.6666667 as a fraction is 2/3