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A large fresh water reservoir has two types of drainage system: **small** pipes and **large** pipes.

**6** large pipes, on their own, can drain the reservoir in **12** hours.

**3 **large pipes and **9** small pipes, at the same time, can drain the reservoir in **8** hours.

How long will **5** small pipes, on their own, take to drain the reservoir?
**Find here the exact time required!**

**Here is the question!**
Let **T** be the **capacity** of the tank. Let **L** be the** large** pipe and **S** be the **small** pipe.

**T/6L = 12 **

L = T/72

T/(3L + 9S) = 8

Putting **L = T/72,**

S = T/108

Hence T/5S = 108/5 gives S = **21.6 **hours.

To conclude, small pipes require **21.6** hours i.e.** 21 hours** and** 36 minutes** to drain the reservoir.
Someone drove from **Aardvark** to** Beeville.**

On the **first,** day they traveled **1/3** of the distance.

On day** two, **they traveled **1/2** of the remaining distance.

On day **three**, they traveled **2/3 **of the remaining distance.

On day **four**, after covering **3/4 **of the remaining distance, they were still **5 miles** away from Beeville.

How many miles had they covered so far?
**Know the total distance traveled!**
** **
**Click for the question! **
We need to start in reverse.

In last part after covering** 3/4** still** 5 miles** left which accounts for **1/4** of remaining distance. Hence, **20 miles** were left at the start of DAY 4.

On **DAY 3**, 2/3rd covered leaving 20 miles for** DAY 4**. That means 20 miles distance is remaining 1/3rd. Hence, at the start of **DAY 3**, **60** miles were left.

On** DAY 2**, 1/2 of covered leaving 60 miles for **DAY 2**. So that means 60 miles distance is remaining 1/2. So at the start of** DAY 2**, **120** miles yet to be covered.

On **DAY 1**, 1/3 of covered leaving 120 miles for** DAY 2**. Meaning 120 miles distance is remaining 2/3. Hence, **180 **miles yet to be covered at the start of DAY 1.

Out of 180 miles, **175** covered in 4 days still 5 miles left.
**Six** people park their car in an underground parking of a store.
The store has** six floors** in all. Each one of them goes to different floor.
**Simon** stays in the lift for the longest.
**Sia** gets out before** Peter** but after Tracy.
The first one to get out is** Harold.**
**Debra** leaves after **Tracy** who gets out at the** third** floor.

Can you find out who leaves the lift at which floor?
**Was it really so difficult?**
**What was the given data?**
The sentence 'The first one to get out is Harold.' suggests that the Harold leaves the lift at the 1st floor.

Similarly, the sentence -__ 'Simon stays in the lift for the longest.' suggests that Simon leaves he lift at the 6th floor.__

Next, sentence -__ 'Debra leaves after Tracy who gets out at the third floor'__ suggests Debra leaves the lift at the 3rd floor.

Clearly, the sentence -__ 'Sia gets out before Peter but after Tracy.'__ suggests that Sia leaves the lift at the 4th floor.

Also, it is clear that Debra leaves the lift at the 2nd floor and Peter at the 5th floor.

Summary -

**Harold** leaves at the** first** floor.

**Debra **leaves at the **second** floor.

**Tracy** leaves at the **third** floor.

**Sia **leaves at the** fourth **floor.

**Peter** leaves at the **fifth** floor.

**Simon** leaves at the **sixth** floor.
**Bob** buys two things in a shop. With his pocket calculator he calculates in advance what he has to pay: **5.25 dollars.** But what he does not notice is that he pressed the **division **instead of the **addition **button. At the desk he is not surprised if he hears that he has to pay **5.25** dollars.
What is the price of the two things **Bob **has bought?

**Know the cost of those 2 things.**