Two-thirds of the T-shirts in a T-shirt shop are blue. Three-sevenths of those T-shirts are on sale. One-half of the blue T-shirts that are on sale are size medium. What fraction of the shop's T-shirts are
blue T-shirts that are on sale and are size medium? Explain.

1/7

Step-by-step explanation:

Of all the shirts, 2/3 of the t-shirts are blue.

Of the blue shirts, 3/7 are on sale.  Of all the shirts, 2/7 are on sale and blue.

Of the blue shirts on sale, 1/2 are size medium.  Of all the shirts, 1/7 are on sale, blue, and size medium.

the answer is c.

step-by-step explanation: