Question

If one-mile equals $5,200$ feet, how many feet are in $7$ miles?

Answer 1

Hint: It is just a simple mathematical calculation, if one egg costs $2$ rupees, then $10$ eggs cost $20$ rupees. Which means we have to multiply the cost of one egg by $10$ to get the answer for the cost of $10$ eggs. And the answer for the given question is also the same as this egg problem.

Complete step by step solution:
In the question, it has given that $1$ mile is equal to $5,200$ feet. This is our given statement. For two miles it will be equal to $10400$ feet, for three miles it will be equal to $15600$, for four miles it will be equal to $20800$feet, for five miles it will be equal to $26000$ feet , for six miles it will be equal to \[31200\] and for seven miles it will be equal to $36400$ feet.

Here it seems a big procedure to solve this, it took one or two minutes to solve the whole problem, but for the larger value it takes more time to calculate and to avoid this multiplication were invented. It enables us to find the large value within a few seconds. And the multiplication worked very well and still helped mankind in a most efficient way. So, let us use the multiplication to solve this problem.

We know that,
$1$ mile$ = 5200$ feet
To find the value for $7$ miles, multiply both sides by $7$ we get,
$7$ mile$ = 36400$ feet
And that’s it we got our answer within a few seconds.

Note: In ancient times, people first invented the addition and subtraction. But they struggled when the problem became more complicated and to avoid this multiplication and division were invented. And it helps mankind a lot.