Question 189170
Let x and y = no of shares bought

3x+4.5y=1950 (1)
x+y=450      (2)

Divide both sides of (1) by 3, we get:

x+1.5y=650
x+y=450

Subtract (2) from (1), we get:

0.5y=200

y=400

x+400=450
x=50

So Mr. Wise bought 50 of $3.00 share and 400 of $4.50 share