The ratio in which Adm, Ming and Clinton sold sandwiches = 4:7:3
Number of sandwiches sold by Ming = 91
Let us assume the common ratio to be = x
Then
7x = 91
x = 91/7
 = 13
Then
The number of sandwiches sold by Adm = 4 * 13
                                  = 52
The number of sandwiches sold by Clinton = 3 * 13
                                    = 39
So
The total number of sandwiches
 sold by Adm, Ming and Clinton = 52 + 91 + 39
                          = 182.
So a total of 182 sandwiches were sold by Adm, Ming and Clinton.
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