Question

please answer this questions:-D​

Answer 1

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1. work done by a in 3 days $3 \div 15 \\ = 1 \div 5 \\ = 0.2$

2.work left for b $12 \div 15 \\ = 0.8$

3.no. of days b will take$3 \div 4 = 12 \div x \\ 3 \times 4 = 12.4 \times 4 = 16 days$