Question

If 12chocolates bars cost 180,what would be the cost of 30 chocolate bars

Answer 1

$one \: chocolate \: is \: 180 \div 12 = 15 \\ 30 \: chocolates \: is \: 15 \times 30 = 450$

Answer 2

the Cost of 1 chocolate =x
12chocolates=₹180
12x=180
x=180/12
x=15
one chocolate =₹15
cost of 30 chocolates=?
30*15=₹450
cost of 30 chocolates =₹450