Unitary method Questions

1.       If 5 men working 6 hours a day can reap a field in 20days , in how many days will 15 men reapthe field , working 8 hours a day ?( 5 days)\ 2.       15 labourers can fill 35 boxes in 7 days . How many labourers can fill 65 boxes in 5 days ?  ( 39) 3.       If 22.5 metres of a uniform rod weight 85.5 kg , what will be the weight of 9 metres of the same rod ?( 34.2 kg) 4.       If 15 men can reap a field in 35 days, in how many days will 21 men reap the field ?( 5) 5.       40 men can build a wall 20 m high in 15 days. The number of men required to build a similar wall 25m high in 6 days , will be (125) 6.       120 men had provisions for 200 days. After 5 days ,30 men died due to epidemic. The remaining food will now last for (260 days) 7.       If 20 articles cost Rs. 90, the cost of 9 articles is (40.50) 8.       A garrison had provisions for a certain number of days.After 10 days, 1/5th of men desert and it is found that the provisions will now last just as long as before .How long was that ?( 50 days) 9.       A rope makes 140 rounds of a cylinder with base radius 14 cm. How many times can it go round a cylinder with base radius 20 cm.( 98)