A box contains 40 envelopes of which 25 are ordinary and 16 are unstamped. The number of unstamped ordinary envelopes is 10.
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wrong.....
no. of envolopes=40
ordinary stamps=25
remaining=15
so from the ordinary ones suppose 16 are unstamped so 25-16=9
no. of envolopes=40
ordinary stamps=25
remaining=15
so from the ordinary ones suppose 16 are unstamped so 25-16=9
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