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If 1/5 of 3000 keyboards are out of order, how many remain functional?

If 1/5 of 3000 keyboards are out of order, how many remain functional?

Explanation
  • 1/5 of 3000 = 3000 × 1/5 = 600 (out of order).

  • Remaining keyboards = 3000 - 600 = 2400.