Question

Qual o número de pessoas que preferem apenas o automóvel do tipo A? (VALENDO 100PTS)

Answer 1

$A=400~~~B=450~~~C=520\\A\cap B=100~~~A\cap C=200~~~B\cap C=300~~~A\cap B\cap C=50\\So~A\cap B=50~~~So~A\cap C=150~~~So~B\cap C=250\\So~~A=400-(50+150+50)=400-250=150\\So~~B=450-(50+250+50)=450-350=100\\So~~C=520-(150+250+50)=520-450=70\\\\Portanto:\Larged\boxed{ Apenas ~A=150~veiculos}$

Answer 2

Somente A:

$\boxed{\boxed{\mathsf{400-50-50-150=150}}}$