CfvcfvvDeposito = x \ \ \ \ Sacamos \ la \ mitad \ to \ dfrac{1}{2}x, entonces \ queda \ la \ mitad \ to \ dfrac{1}{2}x \ \ \ \ \ \ De \ la \ mitad \ to \ frac{1}{2}x \ que \ quedo \ sacamos \ to \ dfrac{1}{2} \ left( \ dfrac{1}{2}x \ right) \ to \ boxed{ \ to \ frac{1}{4}x}, \ \ \ \ \ \ \ quedo \ to \ dfrac{1}{2}x - \ dfrac{1}{4}x = \ dfrac{2 - 1}{4}x = \ dfrac{1}{4}x \ \ \ \ \ \ retiramos \ to \ dfrac{3}{5} \ left( \ dfrac{1}{4}x \ right) \ to \ dfrac{3}{20}x \ \ \ \ \ \ quedo \ to \ dfrac{1}{4}x - \ dfrac{3}{20}x = \ dfrac{5 - 3}{20}x = \ dfrac{1}{10}x
a) En el depósito han quedado \ dfrac{1}{10} \ del \ total
primero se vació la mitad del depósito \ frac{1}{2}x
después se vació un la mitad del resto \ frac{1}{4}x
luego tres quintos de lo que quedaba \ frac{3}{20}x
Se vació \ dfrac{1}{2}x + \ dfrac{1}{4}x + \ dfrac{3}{20}x = \ dfrac{10x + 5x + 3x}{20} = \ dfrac{18}{20}x = \ boxed{ \ dfrac{9}{10}x }
Se ha vaciado nueve decimos del depósito
b) quedaron 40 litros \ dfrac{1}{10}x = 40 \ litros \ \ \ \ x = 40 \ litros * 10 \ \ \ \ \ boxed{Deposito = 400 \ litros}
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