Question

if 7 pencils cost $4.20c, then 3 pencils cost ?

Answer 1

Answer:

Step-by-step explanation:

$1.8

Pencils    Cost

7               4.20

3                  ?

_______________________

Thus, (4.20*3)/7

= 1.8

Answer 2

Answer:

The cost of 3 pencil is $ 1.8  .

Step-by-step explanation:

Given information,

The cost of 7 pencils is $4.20 .

We have to find out the cost of 3 pencils.

As,

The cost of 7 pencil = 4.20

The cost of 1 pencil = $\frac{The \:cost \:of\: 7 \:pencils}{7}$

The cost of 1 pencil = $\frac{4.20}{7}$

The cost of 1 pencil = 0.6

So,

The cost of 3 pencil = the cost of one pencil × 3

The cost of 3 pencil = 0.6 × 3

The cost of 3 pencil = 1.8

Hence,

The cost of 3 pencil is $ 1.8  .