There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?. a ... 4 b ... 5 c ... 6 d ... 7.

Question

Mathematics

Josie Patton

17 June, 15:41

There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?. a ... 4 b ... 5 c ... 6 d ... 7.

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Answers (2)

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River Heath · Answer 1

Out of the following choices given, if 7 balls are green and the sum of red balls and green balls is less than 13, at most there are 6 red balls. The answer is C.

Clayton · Answer 2

There are 20 balls.

7 balls are green

20-7=13

So, we need to red balls, and the sum of the red and green balls are 13.

We already know that the green balls are 7

So, 13-7=6

Answer: C - 6