We are to find the number of t-shirt the group can buy given $250
Cost of first t-shirt = $35
Cost of each additional t-shirt = $11
Total amount with the group = $250
number of t-shirt the group can buy = x
The equation:
250 = 35 + 11x
250 - 35 = 11x
215 = 11x
divide both sides by 11
x = 215/11
x = 19.5
The group can not buy a decimal number of t-shirt.
x will be rounded down to 19
Therefore,
the total number of t-shirt the group can buy is 1 + 19
= 20 t-shirt
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