Mental and floor lamp sells

Question

kevin sells metal lamps that he welds himself. His floor lamps sell for $120 and his table lamps sell for $75. If he took in $1740, and he sold 8 table lamps, how many floor lamps did he sell?

Answer 1

total = 1740

 

Let x equal the number of floor lamps that were sold

Let y equal the number of table lamps that were sold

 

You must multiply the cost of one lamp with how many lamps were sold in order to get the total.

 

120x + 75y = 1740

 

He sold 8 table lamps so substitute 8 for y.

 

120x + 75(8) = 1740    Multiply 75 and 8 to get the total profit from table lamps

120x + 600 = 1740      Now subtract that profit (600) from both sides

120x = 1140                Divide both sides by 120

x = 9.5

 

Round to the nearest whole number.

 

The number of floor lamps he sold is 10.