If 2men or 3 boys take 40 hours to do a certain piece of work , how long will 4 - Maths - Symmetry

Question

If 2men or 3 boys take 40 hours to do a certain piece of work , how
long will 4 men and 9 boys working together take to complete the
work ? (solve by unitary method)

Neha Sethi · Accepted Answer

Given: Work done by 2 men=Work done by 3 boys
So, Work done by 1 men=Work done by 32 boys
So, Work done by 4 men and 9 boys=Work done by 32+9=3+182=212 boys
Since 3 boys  can complete the work in 40 hours So, 1 boy  can complete the work in  40×3=120 hoursThen ,4 men and 9 boys can complete the work in 120212=807= hours

If 2men or 3 boys take 40 hours to do a certain piece of work , how long will 4 men and 9 boys working together take to complete the work ? (solve by unitary method)