Question

a box contains 40 envelopes of which 25 are ordinary and 16 are unstamped. The number of unstamped ordinary

envelopes is 10. What is the probability that an envelope chosen at random from the box is a stamped non-ordinary envelope

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Answer 1

Answer:

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Answer 2

probability that an envelope chosen from the box is a stamped air-mail envelope = 9/40

Step-by-step explanation:

Total Envelopes  = 40

Ordinary Envelopes = 25

Air Mail Envelopes  = 40-25 = 15

UnStamped Envelopes = 16

Stamped envelopes = 40-16 = 24

Unstamped ordinary Envelopes = 10

Stamped ordinary enveloped = 25 - 10 = 15

Stamped air mail envelope = 24 - 15  = 9

probability that an envelope chosen from the box is a stamped air-mail envelope = 9/40

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