Respuesta :

for the very top one you give each friend 10 pieces.....
the first one is 10 because 30 divided by 3 is 10. I'm not sure on the second one. the third one is 1.5 because 2.50 multiplied by 3 is 7.5 and 9 minus 7.5 is 1.5. the fourth one is 15 because 3 multiplied by 5 is 15.