Question

A glass jar contains blue and red balls. If there are 30 balls altogether and out of them 20 are blue. Find the probability of selecting a red ball

Answer 1

Answer:

10

__

30

Step-by-step explanation:

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Answer 2

Answer:

A jar contains 30 marbles, of which 20 are red and 10 are blue. If 9 of the marbles are removed, how many of the marbles left in the jar are red?

(1) Of the marbles removed, the ratio of the number of red ones to the number of blue ones is 2:1.

(2) Of the first 6 marbles removed, 4 are red.