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Standard VIII

Mathematics

Compound Variation

How many litr...

Question

How many litres of pure acid are there in 4 litres of a 20% solution?

1.6 ltr

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0.8 ltr

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Cannot be Determined

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None of these

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Solution

The correct option is B
0.8 ltr

$\frac{20}{100} \times 4 = 0.8 l i t r e s$

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Similar questions

Q. How many litres of pure acid are there in

8

litres of a

20 %

concentrated acid solution ?

90 %

acid solution

(90 %

pure acid and

10

water) and

97 %

acid solution are mixed to obtain

21

litres of

95 %

acid solution. How many litres of each solution are mixed?

90% acid solution (90% pure acid and 10% water) and 97% acid solution are mixed to obtain 21 litres of 95% acid solution. How many litres of each solution are mixed.

Let x litres of 90% and y litres of 97% be mixed; then x + y = 21
and 90% of x + 97% of y = 95% of 21.

Q. A solution of

8 %

boric acid is to be diluted by adding a

2 %

boric acid solution to it. The resulting mixture is to be more than

4 %

but less than

6 %

boric acid. If there are

640

litres of the

8 %

solution, how many litres of

2 %

solution will have to be added?

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How many litres of pure acid are there in 4 litres of a 20% solution?

The correct option is B 0.8 ltr 20100×4=0.8litres

The correct option is B
0.8 ltr

$\frac{20}{100} \times 4 = 0.8 l i t r e s$