00:00A single tap can fill an empty tank in 12 hours.
00:02Our scientific problem is: if the amount of water flowing from the tap is reduced by 20% over time, how many hours will it take for the tap to fill this tank?
00:11Now, friends, if x amount of water flows from the tap and it fills an empty tank in 12 hours...
00:21In science, the amount of water flowing from the tap was x at one time, and when it is reduced by 20%, how do we write it, friends?
00:28We will write it as minus x multiplied by 20 divided by 100.
00:33My friends are asking how many hours it will take to fill this tank in t hours, depending on what can be done to reduce the quantity.
00:42Now, what is x times 20 divided by 100?
00:461, isn't it 5? 5x minus x 4x divided by 5.
00:50This is actually 4x divided by 5.
00:53Isn't x larger, guys? It's been reduced to 4x divided by 5, right guys?
00:58Its speed has decreased. So if it's 12 hours, what should this t-hour value be, guys?
01:03It needs to be higher.
01:05So while this area is decreasing, this area is increasing.
01:07So what is this, guys?
01:09It's an inverse relationship.
01:10In this case, the inverse proportionality will be calculated as follows.
01:14We'll say x times 12.
01:15We'll say it equals t times 4 times x divided by 5.
01:20When we solve this equation, we find our value t.
01:224, 1, 3.
01:24The x's cancel out.
01:26What is t when we perform cross-multiplication?
01:30We can easily find out that it's 15, friends.
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