A) 26.34 litres | B) 27.36 litres |

C) 28 litres | D) 29.16 litres |

Explanation:

Amount of milk left after 3 operations

litres

A) 80% | B) 70% |

C) 75% | D) 62% |

Explanation:

Water in 60 gm mixture=60 x 75/100 = 45 gm. and Milk = 15 gm.

After adding 15 gm. of water in mixture, total water = 45 + 15 = 60 gm and

weight of a mixture = 60 + 15 = 75 gm.

So % of water = 100 x 60/75 = 80%.

A) 6 ml | B) 11 ml |

C) 15 ml | D) 9 ml |

Explanation:

Let us assume that the lotion has 50% alcohol and 50% water.

ratio = 1:1

As the total solution is 9ml

alcohol = water = 4.5ml

Now if we want the quantity of alcohol = 30%

The quantity of water = 70%

The new ratio = 3:7

Let x ml of water be added

We get,

=> x=6

Hence 6ml of water is added.

A) 25% | B) 30% |

C) 17% | D) 19% |

Explanation:

He has gain = 15 - 12 = 3,

Gain% = (3/12) x 100 = (100/4) = 25.

He has 25% gain.

A) 27 % | B) 26 % |

C) 29 % | D) 21 % |

Explanation:

Let the percentage of benzene = X

(30 - X)/(X- 25) = 6/4 = 3/2

=> 5X = 135

X = 27

So, required percentage of benzene = 27 %

A) 24.52 litres | B) 29.63 litres |

C) 28.21 litres | D) 25.14 litres |

Explanation:

Given that container has 50 litres of milk.

After replacing 8 litres of milk with water for three times, milk contained in the container is:

= 29.63 litres.