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ATQ,
Let the number of team members and average weight be 'n' and 'm' kg, respectively.
So, mn - 4 × 65 = (n - 4) × (m - 1.5)
⇒ mn - 260 = mn - 1.5n - 4m + 6
⇒ 4m + 1.5n = 266 --------- (I)
And, mn - 5 × 66 = (n - 5) × (m - 2.5)
⇒ mn - 330 = mn - 2.5n - 5m + 12.5
⇒ 5m + 2.5n = 342.5 -------- (II)
Now solving:
5 × equation I: 20m + 7.5n = 1330
4 × equation II: 20m + 10n = 1370
Subtracting:
7.5n - 10n = -40
⇒ -2.5n = -40
⇒ n = 16
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