SAT Math Practice Question #28073 - SATify | SATify

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SAT Math Practice Question #28073 - SATify | SATify

#28073

algebra

systems

medium

90 sec

There are 3 numbers $X, Y, Z$ such that $7 Z - 21 X = 35$ and $7 Y + 28 X = 42$ . What is the average of $X, Y,$ and $Z$ ?

A.

$3$

B.

$\frac{10}{3}$

C.

$\frac{11}{3}$

D.

$4$

E.

Not uniquely determined