In fruit flies, curved wings are recessive to normal wings, and ebony body is recessive to gray body. A cross was made between two true-breeding flies, one with normal wings and gray body, the other a fly with curved wings and ebony body. The F1 offspring were thus hybrids. These hybrids were crossed to each other (dihybrid cross). For observations, 120 flies were collected. If these traits are independently assorting, what is the expected number of flies with curved wings and gray body