Atire dealer sells 2 tires for as much as he paid for 3 tires. he paid $240 for a dozen tires. what is the total profit on 12 tires?

 he paid 240/12 = 20 per tire

 so he pays 20 *3 = 60 for three tires

he sells 2 for 60.  60-40 = 20 profit per 2 tired

20 *6 = $120 profit for 12 tires

2

step-by-step explanation:

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column