A mixture is composed of 11 parts of pure milk and 2 parts of water. If 35 litres of water were added to the mixture then the new mixture will contain twice as much pure milk as water, then how many litres of pure milk does the original mixture contain?

Correct Answer: 2

Correct Answer: 12800

Correct Answer: 35

Correct Answer: 500

Correct Answer: 30 Litres

Correct Answer: 56.25%

Explanation:

Let each side of the square be a. Then, area = . a 2
New side = 125 a 100 = 5 a 4. New area =  5 a 4 2 =  25 a 2 16

 

Increase in area =  25 a 2 16 - a 2 = 9 a 2 16
Increase% =  9 a 2 16 * 1 a 2 * 100 % = 56.25%.

Correct Answer: 120

Explanation:

let length = x and breadth = y then  

2(x+y) = 46         =>   x+y = 23  

x²+y² = 17² = 289  

now (x+y)² = 23² 

=> x²+y²+2xy= 529 

=> 289+ 2xy = 529

=> xy = 120  

area = xy = 120 sq.cm

Correct Answer: 75%

Explanation:

let original radius = r and  new radius = (50/100) r = r/2

 

original area =  ?r 2 and new area =  ? r / 2 2

 

decrease in area =  3 ?r 2 / 4* 1 ?r 2 *100 = 75%

Correct Answer: 18

Explanation:

l 2 + b 2 = 41 (or)    l 2 + b 2 = 41  

Also,  l b = 20

l + b 2 = l 2 + b 2 + 2 l b  = 41 + 40 = 81

(l + b) = 9. 

Perimeter = 2(l + b) = 18 cm.

Correct Answer: 336

Explanation:

let ABCD be the given parallelogram 

area of parallelogram ABCD = 2 x (area of triangle ABC) 

now a = 30m, b = 14m and c = 40m

 s=1/2 x (30+14+40) = 42 

 

Area of triangle ABC =  s s - a s - b s - c  

 

= 42 12 28 2= 168sq m 

area of parallelogram ABCD = 2 x 168 = 336 sq m