7 kids walk themselves to school two fifths ride the public bus to school and 32 percent were dropped off how many went kids ride the bus

Question

7 kids walk by themselves to school two fifths ride the public bus and 32percent were dropped off by there gaurdians

Answer 1

Three options (walk, bus, dropped) or (W, B, D for short), so first W%+B%+D% must equal 100%. W%+40%+32%=100% means that 28% walk. So, 7 students = 28% of the total students (or each student = 4%). We can then solve for the number of students comprising the 40% riding the bus (B) easily; which is 10 students. Not asked, but lastly, 8 students were dropped off.