Question

LUISA CONSUMIO 3/5 Y JUAN 1/3 DE UN PASTEL QUE PARTES DEL PASTEL SOBRO

Answer 1

$1- \frac{3}{5}- \frac{1}{3}= \frac{15}{15}- \frac{9}{15}- \frac{5}{15}= \frac{15-9-5}{15}= \\ \\ = \boxed{ \frac{1}{15} \ avo \ del \ pastel \ sobro.}$