Answer:
She typed 15 words in 1 minute
Step-by-step explanation:
Let w represent the number of word typed each minute, we can just use proportion to solve this;
1125 words = 15 minutes
x = 1 minute
cross multiply
1125 = 15x
To get the value of x, divide both-side of the equation by 15x
=

(At the left-hand side of the equation 1125 will be divided by 15 while at the right-hand side of the equation 15 on the numerator will cancel-out the 15 on the denominator leaving us with x)
= x
75 = x
x = 75 words
Therefore, she typed 75 words in 1 minute.