Question
A work can be completed by ‘A’ and ‘B’, alone in
7 days and 14 days, respectively. Find the number of days taken by ‘C’ to complete the same work alone if ‘A’, ‘B’ and ‘C’ together can complete the whole work in 4 days.Solution
Let total work = 14 units (LCM of 7 and 14) Efficiency of ‘A’ = (14/7) = 2 units/day Efficiency of ‘B’ = (14/14) = 1 units/day Combined efficiency of ‘A’, ‘B’ and ‘C’ = (14/4) = 3.5 units/day Efficiency of ‘C’ = 3.5 – (2 + 1) = 0.5 units/day Required time taken = (14/0.5) = 28 days
Which of the following insects is the carrier of grassy stunt pathogenic virus?
The silk fibres are held together in cocoon by a substance known as
The process of estimating changes in insect distribution and abundance, providing information about their life history and the influence of biotic and a...
Host tree species for Muga silkworm is ________
Which class of pesticides, known for their nerve poison properties and containing compounds like carbaryl, made a significant impact in the 1950s?
Insects, which feed on one type of food, are called _______.
The type of glands associated with the insect's head appendages is primarily responsible for silk production in certain insect larvae is
Shellac is secreted by
The component of the insect's body wall primarily functions as a multifaceted shield, offering protection against physical injury, water loss, and the e...
The total number of abdominal legs in the larval stage of the mustard sawfly is ____.
Relevant for Exams:
