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Entire work efficiency of Ajay is 10 x 3 unit/day = 30 units Bittu work efficiency is 15 x 2unit/day = 30units ATQ, Let no. of days taken by Ajay and Bittu together to complete the rest work be ‘x’ days. 3 × 3 + (3 + 2) × x = 30 5x = 21 x = 4.2 days Total days = 3 + 4.2 =7.2 days
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