Page 19 - CT&AI_CLasa_7_Part_1

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