word problem

Question

At a pet store the female lizards are sold for $8 each and the males are sold for $5 each on Saturday 20 lizards were sold for 139 how many females and how many males were sold

Answer 1

number of females = f

number of males = 20 - f

 

($8)f + ($5)(20 - f) = $139

 

8f + 100 - 5f = 139

 

3f = 39

 

f = 13

20 - f = 7

 

The store sold 13 females and 7 males.