If p= 7cm and q= 5cm both to the nearest cm, find: a)largest possible value for p+q
b)the smallest possible value for p+q
c)largest possible value for p-q

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6 adults and 9 children went.

a + c = 15

12a + 9c = 153

12(6) + 9(9) = 153

72 + 81 = 153