Solution:

Decreases by 4%

Explanation:
New Length : 1.2
New Height : 0.8

Area = 1.2 * .8 = 0.96 (Decreases by 4%)

Solution:

25

Explanation:
0.20x + 0.25y =11.25
x+y = 50
=> x + (11.25-x/5) * 4 = 50-
=> x/5 = 5
=> x=25

Solution:

2:3

Explanation:
100-60 = 40
Ration => 40:60 = 2:3

Solution:

6.67%

Explanation:
Originally in 10000 gallons of liquid, we have 5% potassium chloride which is equal to 500 gallons
Now 2500 gallons evaporated
10000-2500 = 7500
Required percentage = (500/7500) * 100 = 6.67 %

Solution:

1) 24
2) 24
3) 0
4) 8

Solution:

Rs. 1200

Solution:

Consider each term as a description of the preceding term. The first term is one '1':11. The second term is two times '1':21.

Let us write the series in the above manner
One 1: 11
Two 1s: 21
One 2 and one 1: 1211
One 1, one 2 and two 1s: 111221
Three 1s, two 2s and one 1: 312211

Hence the next term is 312211

Solution:

An interview puzzle probably can't get easier than this.

Speed = Distance / Time

With Michael's car
Speed = 715/13 = 55 Km/h

With Lincoln's Car
Speed = 385/7 = 55 Km/h

Thus the difference between the speeds is zero and both of them are traveling at the same speed in their respective cars.

Solution:

We are given a fact that we have to mix equal quantities of b and c
Thus we may as well take average of them both and consider them as a single type

Let us call that type as d
The price will be 170/2 = Rs.85/Kg

Now we have to mix only a which is Rs.95/Kg and d which is Rs.85/Kg

If you compare with the target price, a is Rs.5 more than it and d is Rs.5 less than it

Thus we may mix 50% of each into the final mixture

Required a = 50 Kg
Required d = 50 Kg
D is an equal mixture of b and c thus the final mixture will have 25 kg each of b and c.

So in order to obtain the required results, we will have to mix 50 Kg of a and 25 Kg of each b and c.

Solution:

Before moving forward with the solution do keep in mind that the answer is demanded in minutes.

Drops in the bucket = x
Time taken to leak z drops = t seconds
Time taken to leak one drop = t/z seconds

Time taken to drop x drops = (x.t)/z seconds
We must convert it into minutes for our final answer
So the minutes taken to leak x drops = (x.t) / (z.60)