Question

A contractor with a work force of 420 men can complete a work of construction of
a building in nine months. Due to request by the owners he was asked to complete
the job in seven months. How many extra men he must employ to complete the job?
2 day if he roads 18 nagas every day How many days​

Answer 1

$\sf\red{αиѕωєя}$

Men Time

420 9 months

x 7 months

$\sf{As \:the \:number \:of\: workers\: is\: inversely\: proportional\: to \:time \:taken:}$

$\sf{420 \times 9 = x \times 7 = x = \frac{420 \times 9}{7} = 540}$

∴ extra men needed: 540−420=120