Question

If paintbrushes cost $1.50$ each and canvases cost 6 times that much, which of the following represents the cost, in dollars, of $p$ paintbrushes and $c$ canvases?

• A. $7.5pc$
• B. $10.5pc$
• C. $9c+1.5p$
• D. $10.5(p+c)$

Answer 1

Answer: (C)

$9c+1.5p$

Cost of $1$ paintbrush $=1.50$

Hence cost of $p$ paintbrushes$=(p\times 1.5)$

Also,

Cost of $1$ canvas $=1.50\times 6=9$

Hence cost of $c$ canvases$=(c\times 9)$.

So,

Cost of $p$ paintbrushes and $c$ canvases$=1.5p+9c$