OK if you want hard here here are sixty cups on a table. If one falls down, then how many remain

If one cup falls down then there will be 59 cups left.

60 you never said it fell on the floor you said that it had only fallen

Explanation:

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

answerscientific theory;