TCS Company Logical Reasoning Blood Relations

a 90 kg salt solution has 10% salt in it how much water must be evaporated from it so that solution contain 25% salt.

Read Solution (Total 3)

10%of 90=25% of x =>(solution) x=36kg salt=9kg water=36-9=27kg

water to be evaporated=81-27=54
13 years agoHelpfull: Yes(21) No(8)

90 kg water contains 81 kg water and 9 kg salt... (10% salt)
for salt to be 25% water must be 4 times than salt... therefore water=9*4=36 kg
total water to be evaporated= 81-35= ""46 kg""
13 years agoHelpfull: Yes(2) No(12)
(10/100)*90=(25/100)*x
x=36kg, already v have 9 kg of salt(i.e 10% of 90kg) and 81kg of water
therefore,water to be evaporated is 81-(36-9)=54kg
10 years agoHelpfull: Yes(0) No(0)

TCS Other Question

A father and his son go out for a 'walk-and-run' every morning around a track formed by an equilateral triangle. The father's walking speed is 2 mph and his running speed is 5 mph. The son's walking and running speeds are twice that of his father. Both start together from one apex of the triangle, the son going clockwise and the father anti-clockwise. Initially the father runs and the son walks for a certain period of time. Thereafter, as soon as the father starts walking, the son starts running. Both complete the course in 45 minutes. For how long does the father run? Where do the two cross each other? Suppose n is an integer, such that the sum of the digits of n is 2, and 10^10 < n < 10^11 . The number of different values for n is: