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fomenos
3 years ago
7

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a blue marble is 1/9 There are 45 ma

rbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.
Mathematics
1 answer:
Lyrx [107]3 years ago
3 0

Answer:

40

Step-by-step explanation:

Since the probability to choose a blue marble is 1/9, there must be 5 blue marbles since 45 * 1/9 = 5

Subtract 5 from 45 to get 40, since the rest of the marbles are red.

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6 0
2 years ago
Find the solution to the system:
Sliva [168]

Answer:

u = 12, v= 15

Step-by-step explanation:

Given the system of simultaneous equation:

1/6 u− 1/3 v=−3... (1)

0.2u+0.1v=3.9...(2)

Rewriting both equation as fraction

1/6 u− 1/3 v=−3

1/5 u + 1/10 v = 39/10

Multiplying equation (1) by 6 and (2) by 10 we have:

u - 2v = -18... (3)

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Using elimination method, we will first multiply equation (3) by 2 and (2) by 1 to have:

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Substituting v = 15 into equation (3) to get u we have:

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The solution to the system of simultaneous equation are u = 12 and v = 15

7 0
3 years ago
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