Question

if a 7 pen cost $4.20what is tha cost of 3 pens

Answer 1

The answer is 1.80

7,20 devided by 7 = .60

.60 times 3 =1.80

Answer 2

Solution: Since, cost of 7 pen =$ 4.20.
Therefore, the cost of 1 pen=$4.20/7
Hence, the cost of 3 pen=4.20/7×3
= 12.60/7
=$ 1.8