Question
The average number of books on history, polity and
geography in a library is 190, and the average number of books on history and geography is 160. If the number books on geography is 20% less than the number of books on polity, then what is the number of books on history in the library?Solution
Let the number of books on History, Polity and Geography be x, y and z respectively. Given, (x + y + z)/3 = 190 Or, x + y + z = 570 ….. (1) And, (x + z)/2 = 160 Or, x + z = 320 ….. (2) From equation 1 and 2 Number of books on polity = y = 250 Number of books on geography = 0.8 × 250 = 200 Therefore, number of books on history = 570 – (250 + 200) = 120
Which of the following is not a benefit of seed hardening?
In which year was the “Krishi Vigyan Kendra” (KVK) programme launched by ICAR?
Legume crops includes
(A) Pigeon pea
(B) Greengram
(C) Lentil
(D) Horsegram
(E) Rapeseed
Choose the correct answer from the options given below:
Excess copper induces deficiency of which mineral in plants ?
Which of following group of plant nutrients is as structural elements?
Study and selection, planting, care and removal of individual trees, shrubs, vines and other perennial woody plants is known asÂ
Which of the following is considered as power house of the cell?
Which initiative offers open-source infrastructure, including farmer, village map, and crop sown registries, to create farmer-centric solutions?
Leaf curl disease of cotton is due toÂ
Central Institute of Arid Horticulture was located at
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