We have been given that, a solution is kept between 30° C and 35° C.

Let C₁ = 30° C

And let C₂ = 35° C

The conversion formula is given by

We need to convert degree Celsius to degree Fahrenheit.

So, take C₁ = 30° C

Using the formula, we have

⇒ F₁ = 9 × 6 + 32

⇒ F₁ = 54 + 32

⇒ F₁ = 86° F

Now, take C₂ = 35° C

Using the formula, we have

⇒ F₂ = 9 × 7 + 32

⇒ F₂ = 63 + 32

⇒ F₂ = 95° F

Therefore, the range of temperature of the solution in degree Fahrenheit is 86° F and 95° F.