Joe’s department store sells pens for 60 cents each and pencils for 40 cents each. diane purchased a total of 17 items (pens and pencils) for $8.20. how many pens did diane purchase?

Diane purchased 7 pens

Step-by-step explanation:

Let

x> the number of pens

y> the number of pencils

we know that

x+y=17

y=17-x > equation A

0.60x+0.40y=8.20 > equation B

Solve the system of equations by substitution

Substitute equation A in equation B and solve for x

0.60x+0.40(17-x)=8.20

0.60x+6.8-0.40x=8.20

0.20x=8.20 -6.8

x=1.4/0.2=7 pens

1 and 2

step-by-step explanation:

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844