Lushkoff is earning thirty five roubles a month. How is he obliged to Sergei for this?

Is Lushkoff a willing worker? Why, then, does he agree to chop wood for Sergei?

A person earns ₹ 54000 per month. He spends 2/15 of his earnings on house rent, 4/9 of his earnings on other household items and saves and remaining. What fraction of amount is the savings in his earnings ?

The income of kumar for 3 months is ₹ 15000. If he earns the same amount for a month - How much will he earn in 5 months ?