Question 1195103
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Rewrite the fractions with a common denominator:  1/3 = 5/15 of the number of blue envelopes is the same as 2/5 = 6/15 of the red envelopes.<br>
That means the ratio of blue envelopes to red envelopes is 6:5.<br>
So let the numbers of blue and red envelopes be 6x and 5x, respectively; then the total of 319 envelopes is 6x+5x=11x.<br>
11x = 319
x = 319/11 = 29<br>
ANSWER: The number of blue envelopes is 6x = 6*29 = 174<br>