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From the condition, 1 man can earn
= 120 rupees per day,
while 1 woman can earn
= 90 rupees per day.
Hence, 7 men and 9 women can earn 7*120 + 9*90 = 1650 rupees in a day.
Answer. 7 men and 9 women can earn 1650 rupees in a day.