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Mathematics, 22.01.2021 18:10 gui00g7888888888888

Arthur has stripy, spotty and plain socks in his drawer. He picks a sock from the drawer at random.
The probability of picking a plain sock is 0.4, and of picking a spotty sock is y.
He is twice as likely to pick a stripy sock as a spotty sock.
Find the value of y. Give your answer as a decimal.

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