Question

pen costs twice as much as a pencil. The total cost of 1 1 pen and 1 1 pencil is $2.10 $ 2 . 10 . If p represents the cost of 1 1 pencil, which equation could you use to find p ?

Answer 1

pen costs twice as much as a pencil. The total cost of 1 pen and 1 pencil is $2.10. If p represents the cost of 1 pencil, which equation could you use to find p ?

2p + p = 2.10 --> p = 0.7

Answer 2

Answer : The equation could you use to find p is,
`2p+p=2.10`

Step-by-step explanation :

Let the cost of 1 pen be, 'x'

and the cost of 1 pencil is, 'p'

As we are given that total cost of 1 pen and 1 pencil is $2.10. The equation will be:

`x+p=2.10` ............(1)

And we have also given that the pen costs twice as much as a pencil. The equation will be:

`x=2p` ............(2)

Now put the equation 2 in equation 1, we get:

`x+p=2.10`

`2p+p=2.10`

Thus, the equation could you use to find p is,
`2p+p=2.10`