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Answer

(a)

10/10 of adults + 2/2 of children = 300

5/10 of adults + 1/2 of children = 150   –(1)

6/10 of adults + 1/2 of children = 166   –(2)

(2) – (1): 1/10 of adults = 16, 10/10 of adults = 160

(b)

Number of children = 300 – 160 = 140

Number of girls = 140/2 = 70 (I suppose girls refer to children, not adults)

 

 

 

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