Number Operations and Properties

18 S 36 R 12 Q 6 P 7 = ? = 18 x 36 ÷ 12 - 6 + 7 = 18 x 3 - 6 + 7 = 54 + 1 = 55

The result is obtained by reversing the digits as 83 - 51 = 32, 26 - 19 = 7 Similarly, 47 - 18 = 29

47 octal is 39 decimal, and 52 octal is 42 decimal. 39 * 42 = 1638 decimal. 1638 decimal converted to octal is 3146.

MOV A,# 85HCPL A ;ADD ,#85 H = 1000 0101 1’s = 0111 1010 2’s = + 10111 1011 = > 7BH

1600-900=10*x700/10=x70=x correct answer

3/8 of 168 * 15 ÷ 5 + x = 549 ÷ 9 + 23563 * 15 ÷ 5 + x = 61 + 23563 * 3 + x = 296189 + x = 296x = 107 correct option

when bases are same powers are added (in multiplication) and subtracted (in the division) 3⁴ * 3⁶ ÷ 3⁹ = 3^x3¹⁰ ÷ 3⁹ = 3^x3^10-9 = 3^x3¹ = 3^xx = 1This option is correct

1:(d) 28[Soln: an = a + (n - 1)× d⇒ 4 = a + (7 - 1) × -4⇒ 4 = a - 24⇒ a = 4 + 24 = 28]

See the pattern 1-3+4-6= -2-2-2....to 25 terms. =-50

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90 + 32 = 122 is an even number.

31 + 41 = 72 is an even number.

This is the right answer.