Question

A box contains 40 envelopes, of which 25 are ordinary and 16 are unstamped , while the number of unstamped ordinary envelopes is 10 . What is the probability that an envelope chosen from the box is a stamped air-mail envelope

Answer 1

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

Step-by-step explanation:

Total Envelopes  = 40

Ordianry Envelopes = 25

Air Mail Envelopes  = 40-25 = 15

UnStamped Envelopes = 16

Stamped envelopes = 40-16 = 24

Unstamped oridnary 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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