One way to calculate the target heart rate of a physically fit adult during exercise is given by the formula h=0.8( 220−x ), where h is the number of heartbeats per minute and x is the age of the person in years. Which formula is equivalent and gives the age of the person in terms of the number of heartbeats per minute?

The answer is:

C.

Step-by-step explanation:

Given:

Where is the heartbeats per minute and

is the age of person

To find:

Age of person in terms of heartbeats per minute = ?

To choose form the options:

Solution:

First of all, let us have a look at the given equation:

It is value of in terms of .

We have to find the value of in terms of .

Let us divide the equation by 0.8 on both sides:

Now, subtracting 220 from both sides:

Now, multiplying with -1 on both sides:

So, the answer is:

C.