B
Explanation:
Because 16+12+4+10= 42
so you have 12 white marble and you have 42 marbles in total so
12 : 42 simplified would be 2 : 7
You were just adding all the other colors and leaving out the white ones but you have to add them all together.
Answer:
B= 2:7
First add all the marbles.
16+12+4+10
16+12=28
28+4=32+10=42
There are 12 white.
Simplify
12:42= 6:21=2:7
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