Answer:
9 packages of chocolate bars
Step-by-step explanation:
Let he bought c packages of chocolate bars and t packages of toffee bars,
Since, he bought 1 fewer package of chocolate bars than toffee bars.
⇒ c = t - 1 -----(1)
Also, he handed out out [tex]\frac{2}{3}[/tex] of the chocolate bars and [tex]\frac{3}{5}[/tex] of the toffee bars,
If he handed out the same number of each kind of candy bar.
[tex]\implies \frac{2}{3}\times c=\frac{3}{5}\times t[/tex]
[tex]10c = 9t[/tex] ( By cross multiplication )
[tex]\implies t=\frac{10}{9}c[/tex] ( Division property of equality )
From equation (1),
[tex]c=\frac{10}{9}c-1[/tex]
[tex]1=\frac{10}{9}c-c[/tex]
[tex]1=\frac{10c-9c}{9}[/tex]
[tex]1=\frac{c}{9}[/tex]
[tex]\implies c = 9[/tex]
Hence, he bought 9 packages of chocolate bars.