Question

O triplo da soma de dois quintos com um quarto

Answer 1

$3(\frac25+\frac14)=3(\frac{8}{20}+\frac{5}{20})=3(\frac{13}{20})=\frac{39}{20}$

Answer 2

2/5 + 1/4 

MCC = 5 { 0. 5, 10, 15, 20, 25, ...}
             4 { 0, 4, 8, 16, 20, 24...} 


8/20 +  5/20 = 13/20 
13/20 .3 
39/20