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    9.  Which operators  should be interchanged  to        decides  to  remove  one  entire  row of tiles.
                         get the maximum value of the expression?            Which of the following expressions represents
                         14 − 2 × 5 + 3             (Logical Thinking)       the number of tiles remaining?
                                                                                                         (Decomposition)
                               (a)  – and ×
                                                                                    (a)  25 × (25 – 25)
                               (b)  × and +

                               (c)  + and –                                         (b)  25 × (25 – 1)

                               (d)  No interchange needed                           (c)  25 + 25 – 1
                     10.  A square garden is paved using 25 tiles in each
                         row and 25 tiles in each column. A designer                (d)  25 × 25

                                       You have a magic box with three compartments, each containing a number.
                                        The numbers are X, Y and Z.

                                                                              3        1
                                                                                    X
                                                                           Z          2
                                                                                   Y
                                       The magic box works according to the following rules:
                                       Rule 1: When you add all the numbers, the result is 248.
                                       Rule 2: If you subtract the number in Compartment 2 from Compartment 1, the
                                       result is 60.
                                       Rule 3: If you multiply the number in Compartment 3 by 5, you get the number
                                       in Compartment 1.
                                       What are the values of X, Y, and Z?

                                             (a)  X = 140, Y = 80, Z = 28           (b)  X = 142, Y = 78, Z = 28

                                             (c)  X = 130, Y = 70, Z = 45           (d)  X = 90, Y = 30, Z = 25

                      cbse handbook questions

                      Tick ( ) the correct option.
                      1.  Identify  the odd  one out  from the following     2.  In certain code, 1 is coded as 2, 3 is coded as
                         expressions,  after INTERCHANGING their             10, 5  is coded as  26. In the  same  way,  4  is
                         operators.                                          coded as A and 6 is coded as B. If C is the sum
                                                                             of A and B, which of the following is correct
                                                                             regarding C?
                               (a)  204 + 3 ÷ 29
                                                                                    (a)  C > 55
                               (b)  67 - 2 × 37
                                                                                    (b)  C < 50
                               (c)  48 ÷ 6 × 3
                                                                                    (c)  C = 50
                               (d)  195 × 49 - 2
                                                                                    (d)  C < 55

                                                                                           Arithmetic Expressions     17

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