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Answer:
y = 3/10
Step-by-step explanation:
(1/3) / (2/5) = (1/4) / y
y = (1/4) (2/5) / (1/3) = (2/20) / (1/3) = 3/10
check: (1/3) / (1/4) = 4/3
(2/5) / (3/10) = 20/15 = 4/3