Can you find the 4 unknowns in this fun math problem?

Hello world and welcome to another funza Academy fun Math video.
Todays problem involves finding values of 4 unknowns.
So here is the problem?
In this figure, we have 4 result values - 13, 8 , another 8 and 6.
And we have 4 unknowns - say, a, b, c and d.
We know certain operations between the unknowns that give us the result values.
For example:
a + b is equal to 8
a + c is equal to 13
b + d is equal to 8
and finally
c - d = 6
Based on this information, can you find the values, of a, b , c and d.
Please pause the video and give the problem a try
And when done, return and watch the solution.

[funzaAcademy]

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[prathamsoni]

I like this academy channel so much. It helped me to solve and understand 10 puzzles

[shitalkanitkar]

Very nicely explained. But perhaps kids might better understand if u start with practical examples. I remember when i was taught this I wondered why about a and b. So if u start with a practical example like there were 10 chocolates and i ate two. So how many did my friend eat. Then the a and b start to make sense