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Answer

(a)
total phone cards : 15 units
phone cards sold : (1/3) x 15 = 5 units
$10 phone cards sold : (2/5) x 5 units = 2 units
$15 phone cards sold : 5 units – 2 units = 3 units
2 units x 10 + 3 units x 15 = 65 units =7800
1 unit = 7800/65 = 120
3 x 120 = 360

(b)
15 units – 5 unit = 10 units = 10 x 120 = 1200

Ans : (a) 360 $15 phone cards; (b) 1200 phone cards.

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