A store is selling quarts of apple juice for $2.80 and quarts of grape juice for $2.20. In a week the store sold 15 quarts of the juice and received $39 from thiose sales. How many quarts of apple juice (a) and quarts of grape juice (g) did the store sell? a ± g = 15 2.8a + 2.2g = 39 [?] apple juice [] grape juice

  

Given 

a + g = 15 g = 15 - a 2.8a+ 2.2 g = 39 

Calculate 

2.8a + 2.2(15 - a) = 39 2.8a + 33 - 2.2a. = 39 0.6a = 39 - 33 

0.6a = 6 

a = 6 ÷ 0.6

a = 10

a = 10 Now using value of a We get g = 15 - a g = 15 - 10

 g = 5 

Therefore there are 5 grapes and 10 Apple