CTS Company Numerical Ability Alligation or Mixture

A mixture of milk and water contains 7% water. What quantity of pure milk should be added to 12 litres of mixture to reduce water to 4%?
1) 5 litres
2) 6 litres
3) 7 litres
4) 8 litres
5) None of these

Read Solution (Total 3)

12 litre of mixture contain 7 % of water i.e quantity of water = 12*7/100 =0.84 litre
Now, 11.16 litre is milk in 12 litre of mix.
So, from question,let x amount of milk is to be added
(11.16+x)/0.84 = 96/4 ( It's saying the % water is reduced to 4% i.e new ratio of water:milk = 96/4)
Solving this equation you will get x=9.
So, ans is none of these.
8 years agoHelpfull: Yes(4) No(0)

ans :(11.16+x)/.84=96/4
x=5
7 years agoHelpfull: Yes(1) No(3)
Current litres= 12
Initial %=7
Final % =4

Direct Formula = (Current Litres*( Initial %-final %))/Final
%--->10*3/4=15 Litres
4 years agoHelpfull: Yes(0) No(0)

CTS Other Question

Present ages of P and Q are in the ratio 4 : 5 respectively. Six years hence the ratio becomes 7 : 8. What is the sum of the present ages of P and Q?
1) 18 years
2) 30 years
3) 36 years
4) Can't be determined
5) None of these
What are the speeds of trains ‘A’ and ‘B’?
II. The speed of train ‘A’ is twice the speed of ‘B’.
II. Train A passes train B in 9 sec and its length is 100 m

Options
1) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
2) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
3) if the data in Statement I alone or in Statement II alone are sufficient to answer the question.
4) if the data, in both the Statements I and II together are not sufficient to answer the question.
5) if the data in both the Statements I and II together are necessary to answer the question.