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(a)
(number of boys x 5 x 5) = (20 – number of girls) x 25 = 500 – 25 x number of girls)
(number of girls x 3 x 5) = (15 x number of girls)
500 – (25 x number of girls) – (15 x number of girls) = 20
number of girls = (500 – 20)/(25 + 15) = 12

(b)
12 x 3 + (20 – 12) x 5 = 76

Ans : (a) 12 girls; (b) 76 tickets.

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