Question
A is twice as efficient as B and can finish a piece of
work in 20 days less than B. B can finish this work in how many days?Solution
Ratio of efficiency of A and B = 2: 1 A will take 1/2 of time as compared to B. Say, B takes 2x days and A takes x days. ∴ 2x – x = 20 ⇒ x = 20 ∴ B takes 20 × 2 = 40 days to do the work.
Law of conservation of mass is not correct for
Who proposed the 'Law of Octaves' in the periodic classification of elements?
Statement I: Glass is not considered as a true compound. Statement II: Glass does not have a definite melting point.
Codes:
What is the primary advantage of superconductors?
Which of the following particles has the least mass?
Biofertilizers convert nitrogen to:
The atomic bomb is based on which principle?
Which law governs the behavior of ideal gases?
Name the source from which aspirin is produced?
The efficiency of a Carnot engine depends on:Â Â Â Â Â