You’ve probably noticed that grasshoppers chirping a lot during hot summer days. In fact, the air temperature can be estimated by monitoring the amount of their chirping:

[[$\text{temperature} = \dfrac{\text{amount of chirping in one minute} + 30}{7} $]]

Calculate the temperature when the grasshopper chirps
a) 160 times in a minute.


b) 100 times in a minute.


c) 30 times in a minute.


Estimate whether the expression gives realistic results.