Answer:
A school ordered 300 bulbs that cost $1 and 150 bulbs that cost $2.
Step-by-step explanation:
Let [tex]u[/tex] denotes number of light bulbs that cost $1 and [tex]v[/tex] denotes number of light bulbs that cost $2.
Twice as many $1 bulbs as $2 bulbs were ordered.
[tex]u=2v[/tex]
A school ordered $600 worth of light bulbs.
[tex]u(1)+v(2)=600\\u+2v=600[/tex]
Put [tex]u=2v[/tex] in [tex]u+2v=600[/tex]
[tex]2v+2v=600\\4v=600\\\\v=\frac{600}{4}\\\\v=150[/tex]
Put [tex]v=150[/tex] in [tex]u=2v[/tex]
[tex]u=2(150)=300[/tex]
Therefore,
A school ordered 300 bulbs that cost $1 and 150 bulbs that cost $2.
