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alina1380 [7]
3 years ago
14

BRAINLIST

Mathematics
1 answer:
marissa [1.9K]3 years ago
7 0
It’s b
Z+23=41
Because you don’t know what z is
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Answer: a) 15 b)

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a)

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For TESTS:

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a) 10X+5X+5X=300 => 20X = 300 => X = 15 days for the lessons

b) 5X+10X+8X = 300 => 23X = 300 => X = 13.04 days for the tests

so they need 15 days to finish both tasks

now if Junyi gets sick we just eliminate his contribution

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If jordan works 10 hours a day, we just replace him with 10/24

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so at the end to complete both tasks they need 29.58 days

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