Answer:
Step-by-step explanation:
Let's say the Physics book costs $x
The Chemistry book will cost $x - $6
Two such Chemistry books will cost;
2($x - $6) = $(2x - 12)
Three such Physics books cost $3x
$(2x - 12) + $3x = $123
$5x - $12 = $123
$5x = $111
x = $22[tex]\frac{1}{5}[/tex]
So the Physics book costs; $22[tex]\frac{1}{5}[/tex]
and the Chemistry book costs $22[tex]\frac{1}{5}[/tex] - 6 = $16[tex]\frac{1}{5}[/tex]
