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rusak2 [61]
2 years ago
12

In a box of marbles, the ratio of red marbles to total marbles is 2:5. the ratio of green marbles to total marbles is 3:10. if t

he marbles that are neither red nor green are blue, how many blue marbles are in the box if there are 40 marbles in the box?
Mathematics
1 answer:
STALIN [3.7K]2 years ago
7 0
Ratio:

Red : Total 
  2   :    5
 (x2)    (x2)
  4   :   10

Green : Total
  3   :       10

Total of red and green marbles = 4 + 3 = 7

Blue marbles = 10 - 7 = 3

10 parts = 40 marbles
1 part = 40 ÷ 10 = 4
3 parts = 4 x 3 = 12

Answer: There are 12 blue marbles.
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but to find the nearest whole number we have to round the place value BEFORE our whole number. (in this case the 9)

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we can now look at this highlighted section of our equation and think... is 10.9  closer to 11 or 10. well logically, to get to 11 from 10.9 we only have to go up by 0.1, rather than to get to 10, where you have to subtract 0.9.

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But to make it easier, remember the rule:

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