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36) When k>0, is subtracted from each of 11, 15, 20 and 30, the numbers so obtained in this order are in proportion. What is the mean proportional between (2k + 2) and 3k²?

A) 32
B) 22
C) 18
D) 30

37) The orbit of which of the following satellites is NOT sun-synchronous?

A) ERS-1
B) Meteosat – 11
C) NIMBUS – 7
D) IKONOS

38) From a rectangular metallic sheet of length 36 cm and breadth 16 cm, three circular plates of radii 6 cm, 4 cm and 2 cm are cut out. If the area of the remaining part of the metallic sheet is equal to the area of a square, then find the length of each side of the square (in cm).(Use л=)

A) 18.6
B) 18
C) 19.4
D) 20

39) Find the greatest value of (a + b) such that an 8-digit number 4523a60b is divisible by 15.

A) 13
B) 15
C) 11
D) 9

40) If the square of a positive number is 6 more than five times the number, what is the number?

A) 6
B) 8
C) 5
D) 9