Certainly! Let’s simplify the problem step by step:

**Average temperature for Wednesday, Thursday, and Friday (W, T, F):**

$\frac{W+T+F}{3}=40$3W+T+F=40

**Average temperature for Thursday, Friday, and Saturday (T, F, S):**

$\frac{T+F+S}{3}=41$3T+F+S=41

**Temperature on Saturday (S):**

$S=42$S=42

Now, let’s substitute the value of

$S$S into the second equation:

$\frac{T+F+42}{3}=41$3T+F+42=41

Multiply both sides by 3 to get rid of the fraction:

$T+F+42=123$T+F+42=123

Subtract 42 from both sides:

$T+F=81$T+F=81

Now, substitute this into the first equation:

$\frac{W+81}{3}=40$3W+81=40

Multiply both sides by 3:

$W+81=120$W+81=120

Subtract 81 from both sides:

$W=39$W=39

So, the temperature on Wednesday (W) is

$3{9}^{\circ}\text{C}$39∘C.