Question 1205552
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Refer to the equations that tutor josgarithmetic set up.
For now the 1st two equations are what we focus on.
A+B+C+D = 900
5A = B+C+D


Notice that both involve B+C+D
We can replace B+C+D in the 1st equation with 5A
The 1st equation turns into A+5A = 900 and that solves to A = 150.


Follow similar steps to determine B and C.



You should have the following
A = 150
B = 180
C = 300
That must mean D = 900-A-B-C = 900-150-180-300 = 270


Lastly, D/900 = 270/900 = 0.30 = <font color=red>30%</font>



Answer: D contributed <font color=red>30%</font> of the total funds.
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