Answer:
The number of $25 shares is 10 and the number of $45 shares is 5
Step-by-step explanation:
Let x be the number of shares of $25 and y be the number of shares of $45
So, total cost of $25 shares = $25x
So, total cost of $45 shares = $45y
Since we are given that The number of $25 shares was 5 less than 3 times the number of $45 shares.
Equation becomes :
--1
Mario invested $475 in $45 and $25 stock shares.
Equation becomes :
--2
Substitute the value of x from 1 in 2




Substitute the value of y in 1
So, the number of $25 shares is 10 and the number of $45 shares is 5