We can create such equation to solve your problem

where x is variable which we want to know.
To solve this we can just divide 600 by 10 to see what the number we want.
600:10=60
The result is 60
Answer:
x=14
Step-by-step explanation:
9x = 3x + 84
9x-3x=84
6x=84
x=84/6
x=14
The number is 778. hope this is right
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Answer:
C.
Step-by-step explanation:
the one u had highlighted