The product-3 and t is greater than 11

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

3.4a=57.8 what is the the value of a

Will mark brainliest! ( explain the answer too, it can be one sentence)