Multiple choice

If 500 ml solution of lemonade contains 40% lemon juice, how much more lemon juice should be added to make it 60%? .

  1. 800 ml

  2. 600 ml

  3. 250 ml

  4. 120 ml
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Quantity of lemon juice in 100 ml = 40mlQuantity of lemon juice in 1 ml = 40/100Quantity of lemon juice in 500 ml = 40/100 x 500 = 200 mlwhen we want to make it 60 % we have to add more lemon juice .Suppose x ml of lemoon juice is added now 

Quantity of lemonade will be =( 500 + x) ml  Quantity of lemon juice will be = ( 200 + x ) ml Now quantity of lemon juice in  ( 500 + x ) ml is ( 200 + x )  Quantity of lemon juice in 1 ml is ( 500 + x ) / ( 200 + x )  Quantity of lemon juice in 100 ml is=                                                  { ( 500 + x ) / ( 200 + x ) } x 100}%The % of lemon juice is 60%(200 + x) / ( 500 + x ) x 100 = 60(200 + x )100 = 60 x ( 500 + x )   20000 + 100 x = 30000 + 60 x   100 x - 60 x = 30000 - 20000  40 x = 10000

     x = 10000 /40

    x = 250 ml

 

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