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For evening consider
Alex = a
Maya = b

For Afternoon consider

Alex = 2b
Maya = a/2

Therefore
Alex total sell is 2(b+a/2)
and total in afternoon is 2b +a/2

now given total earn 1800
So, simple equation can be written as 8(b+a/2) - b = 900

There fore now we will put values from given option

If we consider Alex sell as 120, 180 and 260 then b will not be integer
and if alex sell is 300 then afternoon sell will be 200 which is not in option.

Hence Alex sell will be 240 and total afternoon sale would be 180
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AlexTotal = AlexAf+AlexEv, so AlexEv = AlexTotal-AlexAf
AfternoonTotal = AlexAf+MayaAf
AlexAf = 2*MayaEv, so MayaEv=AlexAf/2
AlexEv = 2*MayaAf, so MayaAf=AlexEv/2

4*(AlexAf+MayaAf) + 6*(AlexEv+MayaEv) = 1800
4*(AlexAf+AlexEv/2) + 6*(AlexEv+AlexAf/2) = 1800
7*AlexAf + 8*AlexEv = 1800

Introducing AlexTotal in the equation:
7*AlexAf + 8*(AlexTotal-AlexAf) = 1800

Clearing AlexAf:
AlexAf = 8*AlexTotal - 1800

Using the values of AlexTotal in the options, only AlexTotal=240 works.
Then AlexAf=120, AlexEv=120 and AfternoonTotal=AlexAf+MayaAf=120+AlexEv/2=120+60=180

Alex Total=240
Afternoon Total=180
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Alex afternoon = X
Alex evening = Y

Maya evening = X/2
Maya afternoon = Y/2

4(X+Y/2)+6(Y+X/2)=1800
7X+8Y=1800

Alex total = X+Y -> Y = (Alex total) - X
7X+8Y=7X+8(Alex total - X)=7X-8X+8(Alex total)=8(Alex total)-X=1800

X=8(Alex total)-1800

If (Alex total)=240, X=120, Y=240-120=120
Afternoon Total = Alex afternoon + Maya afternoon = X + Y/2 = 120+60 = 180

Alex Total=240 and Afternoon Total=180
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