SSAT數(shù)學(xué)免費(fèi)練習(xí)（一）

SSAT數(shù)學(xué)免費(fèi)練習(xí)（一）
    What is the average (arithmetic mean) of 4x + 5, 7x-6,and -8x+2?
    A. x + 1
    B. x + 1/3
    C. 3x + 1
    D. 3x + 1/3
    E. 3x + 3 1/3
    In a classroom of 35 students, 14 our male. What percent of the classroom is male?
    A. 14%
    B. 20%
    C. 30%
    D. 40%
    E. 50%
    If the area of a triangle is 24 and its base is 6, what is the length of the altitude to that base?
    A. 3
    B. 6
    C. 8
    D. 10
    E. unknown