Answer:
Explanation:
To convert the ratio 40:100 in its simplest form., first we can convert it into fraction form.
In fraction form,

The common factors are 40 and 100 are 1,2,4,5, 10 and 20 and the greatest comman factor is 20. So we can divide both the numerator and denominator by 20
The required fraction will be

Now, converting the fraction back into ratio form.

Therefore, the ratio of 40:100 in its simplest form is 2 : 5.