Answer:
x+20/2=3x
x+10= 3x
10=3x-x
10=2x
10/2=x
5=x
hope it helps
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50
Step-by-step explanation:
because 3,650-3,500=150 and then 150/12=12.5x4=50
sorrry .......................
11
4/5
there u go thats quick maths