Question
Sandeep can solve 20 questions in 1 hour. If he
decreased his efficiency by 20%, then how much time would he take to solve the same number of questions?Solution
1 hour = 60 minutes Initial efficiency of Sandeep = 60 ÷ 20 = 3 minutes/question New efficiency of Sandeep = 60 ÷ (20 x 0.8) = 3.75 minutes/question So, time required to finish 20 questions = 3.75 x 20 = 75 minutes Alternate Solution Ratio of new efficiency to old efficiency = 0.8:1 = 4:5 Therefore, ratio of time taken now to ratio of time taken initially = 5:4 Required time taken = 60 x (5/4) = 75 minutes
What order do the majority of stored food grain insect pests belong to?
Which of the following converts the reciprocating motion of the piston into rotary motion of the flywheel?
Deficiency of which vitamin is prominent in those persons who continuously eat ‘polished rice’?
World water day is celebrated on ____ every year.
__________is the fraction of water entering the soil that must pass through the root zone in order to prevent soil salinity from exceeding a specified v...
Parthenium hysterophorus (Congress grass) can be controlled by:
Maximum amount of rice is produced in which state in India?Â
Seed lot certificate colour is:
The cross elasticity of demand between two products is infinite, in case of:
Which of the following statement is incorrect?Â
Relevant for Exams:
