Question

You have a large container of mustard oil.You have used 480 quarts of oil. 76% of the oil remains. How many quarts remain?

Answer 1

There are 1,520 quarts of mustard oil remaining in the container.

Out of the 100%, 76% of oil remains which means 24% of the mustard oil was consumed.

100% - 76% = 24%

Since the 480 quarts of oil is the amount of oil used, it means that 480 quarts is the 24% of the mustard oil.

To get the remaining number of quarts, you must first get the total number of quarts the container held.

1) divide 480 quarts by its percentage to get the total number.

480 / 24% or 480 / 0.24 = 2,000 quarts. total number of mustard oil in quarts.

2) Multiply the percentage of the remaining quarts to the total number of quarts.

2000 x 76% or 2000 x 0.76 = 1,520 quarts remaining.

It can also be done by subtracting 480 from 2000; 2000 - 480 = 1,520.

Answer 2

The best approach to take here is to find out what 1% and 10% are, then multiply them accordingly. 
To find 10%, just divide the amount of quarts by 10.
480/10= 48
Therefore, 10% is 48 quarts.
To find 1%, you then divide the 10% by 10. 
48/10= 4/8
Therefore, 1% is 4.8 quarts.
As you're looking for 76, you can either multiply the 1% by 76, or you can break it down into two parts, which may be easier, which is the method that I will use.
I would split it into 70% and 6%
As you've got 10%, in order to find 70%, you just need to multiply this by 7.
48*7= 336.
you then need to find the odd 6%.
As you've find 1%, you need to then multiply this by 6.
4.8*6= 28.8
You then need to add these together to get your total.
336+28.8= 364.8
As you're looking for the remainder, you then need to take this away from 480.
480-364.8= 115.2
Therefore, you have 115.2 quarts of mustard oil remaining.
Hope this helps :)