`40 Kg` of rice last `30` days in a family of `8` person if `2` guests stay with the family how many days will `40 Kg` of rice last ​

A gobar gas plant produces methane and supplies to the families. If a family requires 15000 kJ of energy per day, how many days will the quota of 20 kg will last (Delta_(c) H of CH_(4) = -1665 kJ mol^(-1) ).

A gobar gas plant produces methane and supplies to the families. If a family requires 15,000 kJ of energy per day, how many days will the quote of 10 kg will last ? (Delta_(c)H "of" CH_(4) = - "1665 kJ "mol^(-1))

40 persons can repair a bridge in 12 days. If 8 more persons join them, then in how many days bridge can be repaired?

In a scout camp, there is food provision for 300 cadets for 42 days. If 50 more persons join the camp, for how many days will the provision last?