Mrs. onusko made 60 cookies for a bake sale she sold 2/3 and gave 3/4 of the remaining cookies to the students working at the sale how many cookies did she have left

she had 5 cookies left. 
2/3 of 60 is 40 that she sold leaving 20, she then gave away 3/4 of them
3/4 of 20 is 15, that she gave away so she has 5 left