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post-22504

2u is from comparing blue balls in the 2 models

Hope it helps 🙂

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thanks

 

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post-22688

If we remove one red ball, the reminder (Total -1) is a multiple of 7.

If we reomve two blue balls, the reminders (Total-2) is a multiple of 5.

Write a small table with two columns. first column is multiple of 7 +1. Second column is multiple of 5 +2. The first match is 22, which is the answer

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post-22514
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An alternative.

Scenario 1 : If Jane removes 1 red ball from the bag,
red ——- 1u
blue ——- 6u

Scenario 2 ; If Jane removes 2 blue balls from the bag,
red ——- 1p
blue ——- 4p

1u + 1 ——- 1p
6u ——- 4p + 2
6u ——- 4(1u + 1) + 2
1u ——- 6/2 = 3
7u + 1 = 7 x 3 + 1 = 22

Ans : 22 balls.

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