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Let the number of hours worked on product X = 3n number of hours worked on product Y = 2n number of hours worked on product Z = n total production of product X = 50×3n = 150n total production of product Y = 80×2n = 160n total production of product Z = 120×n = 120n after change in production total production of product X = 120% of 150n = 180n total production of product Y = 75% of 160n = 120n total production of product Z = 120n now, total production of each product = 180n+120n+120n = 420n Now, 420n = 2520 n = 6 number of hours worked on product X = 3n = 18 h number of hours worked on product Y = 2n = 12 h number of hours worked on product Z = n = 6 h
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