45) A ladder 12.5 metres long is placed with upper against a wall. The lower end of ladder being 7.5 metres from the wall then what is the height of wall from the ground to above upper end of the ladder?

46) In graph ____ is the intersection point of co-ordinate axis.

47) In which quadrant will the co-ordinate of point (-2, 8) lie on the graph?

48) In an alloy of 80 gram copper is 60 gram. The remaining is zinc. The ratio off copper to zinc is

49) A man spends 15% of his income on agriculture, 21% on family and 24% on education of children. If he saves Rs 360, find out the total income.