Advertisements
Advertisements
Question
A 90 kg solution has 10% salt. How much water must be evaporated to have the solution with 20% salt?
Solution
Quantity of solution = 90kg
Quantity of salt
= `90"kg" xx (10)/(100)`
= 9kg
Let x kg of water be ecaporated.
Therefore,
`(9)/(90 - x) = (20)/(100)`
⇒ 900 - 1800 - 20x
⇒ 20x = 900
⇒ x = 45
Therefore, 45kg of water must be evaporated.
APPEARS IN
RELATED QUESTIONS
Solve the following equation:
3a - 4 = 2(4 - a)
Solve the following equation:
3(x + 1) = 12 + 4(x - 1)
Solve the following equation:
p + 0.02 = 0.08
Solve: y + 20% of y = 18
Six times a number is 72, find the number.
Solve the following equations for the unknown: `(2x + 3)/(x + 7) = (5)/(8), x ≠ -7`
Solve the following equations for the unknown: `7 - (1)/sqrt(y)` = 0
The measures of angles of a quadrilateral in degrees are x°, (3x-40)°, 2xo and (4x+20)o. Find the measures of the angles.
A boy played 100 games, gaining Rs 50 on each game that he won, and losing Rs 20 for each game that he lost. If on the whole he gained Rs 800, find the number of games that he won.
A man sells an article and makes a profit of 6%. Had he bought the article at a price 4% less and sold at a price higher by Rs 7.60, he would have made a profit of 12%. Find his cost price.
