Question
8 children and 6 women together can complete a piece of
work in 10 days and work done by a children in one day is one-third of the work done by a women in one day. If 5 children and 7 women started working and after 4 days 2 women left the work and 4 new children joined then, in how many more days will the work be completed:Â Â ÂSolution
 One day work of children = one-third of work done by women in one day Let efficiency of one women = W unit/day And efficiency of one child = C So, W = 3C Total work = (8C + 6 x 3C) × 10 =260C unit 5 children and 7 women started working for 4 days Total work done = (5C + 7 × 3C) × 4 = 104C Left work = 260C – 104C = 156C 2 women replace 4 children = (9C + 15C) = 24C Days required = 156C/24C = 6.5 days Â
When acid reacts with metal carbonate, _______ is/are formed.
Aluminium is extracted from which ore?
Match the following gases with their typical uses:
List I (Gas)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â List II (Uses)
A) Argo...
Malathion is primarily used as a/an:
Litmus paper, used to test pH levels, is derived from which organism?
Which gas is primarily monitored to assess organic pollution in sewage and surface water?
Common name of Sodium Carbonate is?
What is the chemical name of quick lime?
Atomic number of an element is equal to the number of ____ in the nucleus.
Photochemical smog is a resultant of the reaction among