4/7 to a percent is about 57 percent.
She has 3 tops and 3 bottoms if you multiply them you'll get 9. if you do 1,2, & 3 for tops and a, b, & c for bottoms to find the different ways on how she can wear it it'll still be 9.
1 2 3
a b c
1a 2a 3a
1b 2b 3b
1c 2c 3c
Since david ate a quarter of the pizza he ate 3 slices. John ate 4 slices. 4+3=7 , 12-7=5 pieces of pizza are left