Question

Elena purchased brand X pens for $4.00 a piece and brand Y pens for $2.80 a piece. If Elena purchased a total of 12 of these pens for $42.00, how many brand X pens did she purchase?

Answer 1

Answer:

step by step explanation :

1st we will consider the no. of brand X pens Elena purchased to be x

2nd then brand Y pens = 12-x

3rd then the sum of brand X and brand Y is equal to 42

4th x*4 + (12-x)*2.80 = 42

4x + 33.60 - 2.80x = 42

1.20x = 42 - 33.60

x = 8.40/1.20

x = 7 (ANSWER)

therefore Elena purchased 7 brand X pens.

*Then if u want to find brand Y pens put the value of x in 2nd step,

12-x = 12-7 = 5

she purchased 5 brand Y pens .

Hope u got that !