496: 50 men or 80 women can finish a job in , 50 days. A contractor deploys 40 men and 48 women for this work, but after every duration of 10 days, 5 men and 8 women are removed till the work is completed. The work is completed in:
(a) 45 days
(b) 50 days
(c) 54 days
(d) 62 days
497: Consider the following statements :
At the present level of technology available in India, solar energy can be conveniently used to
I. supply hot water to residential buildings.
II. supply water for minor irrigation projects.
III. provide street lighting.
IV. electrify a cluster of villages and small towns.
Of these statements
(a) I, II, III and IV are correct.
(b) II and IV are correct
(c) I and III are correct
(d) I, II and III are correct
498: The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1 ?
(a) 20
(b) 27
(c) 16
(d) 12
499: World Development Report is an annual publication of
(a) United Nations Development Programme
(b) International Bank of Reconstruction and Development
(c) World Trade Organisation
(d) International Monetary Fund
500: In the figure shown below, what is the maximum number of different ways in which 8 identical balls can be placed in the small triangles 1, 2, 3 and 4 such that each triangle contains at least one ball?
(a) 32
(b) 35
(c) 44
(d) 56