Question

w, x, y and z are 4 integers written in order of size, starting with the smallest. The mean of w, x, y and z is 13 The sum of w, x and y is 33 (a) Find the value of z.​

Answer 1

"The mean of w, x, y, and z is 13" translates to

(w + x + y + z)/4 = 13

so that

z = 52 - (w + x + y)

We're also given that "the sum of w, x and y is 33", so

w + x + y = 33

which means

z = 52 - 33 = 19