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Which two numbers should be interchanged to make the given equation correct?
63 ÷ 21 - 42 + 8 × 7 = 135
  • a)
    21 and 42
  • b)
    21 and 8
  • c)
    7 and 63
  • d)
    7 and 21
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which two numbers should be interchanged to make the given equation co...
Given equation is,
63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging numbers and applying BODMAS rule option wise,
(I) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 21 and 42
63 ÷ 42 - 21 + 8 × 7 = 135
1.5 - 21 + 8 × 7 = 135
1.5 - 21 + 56 = 135
1.5 - 35 = 135
-33.5 ≠ 135
(II) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 21 and 8
63 ÷ 8 - 42 + 21 × 7 = 135
7.875 - 42 + 21 × 7 = 135
7.875 - 42 + 147 =135
7.875 + 105 = 135
112.875 ≠ 135
(III) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 7 and 63
7 ÷ 21 - 42 + 8 × 63 = 135
0.33 - 42 + 8 × 63 = 135
0.33 - 42 + 504 = 135
462.33 ≠ 135
(IV) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 7 and 21
63 ÷ 7 - 42 + 8 × 21 = 135
9 - 42 + 8 × 21 = 135
9 - 42 + 168 = 135
9 + 126 = 135
135 = 135.
Hence. the correct option is (D).
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Most Upvoted Answer
Which two numbers should be interchanged to make the given equation co...
Given equation is,
63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging numbers and applying BODMAS rule option wise,
(I) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 21 and 42
63 ÷ 42 - 21 + 8 × 7 = 135
1.5 - 21 + 8 × 7 = 135
1.5 - 21 + 56 = 135
1.5 - 35 = 135
-33.5 ≠ 135
(II) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 21 and 8
63 ÷ 8 - 42 + 21 × 7 = 135
7.875 - 42 + 21 × 7 = 135
7.875 - 42 + 147 =135
7.875 + 105 = 135
112.875 ≠ 135
(III) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 7 and 63
7 ÷ 21 - 42 + 8 × 63 = 135
0.33 - 42 + 8 × 63 = 135
0.33 - 42 + 504 = 135
462.33 ≠ 135
(IV) 63 ÷ 21 - 42 + 8 × 7 = 135
Interchanging 7 and 21
63 ÷ 7 - 42 + 8 × 21 = 135
9 - 42 + 8 × 21 = 135
9 - 42 + 168 = 135
9 + 126 = 135
135 = 135.
Hence. the correct option is (D).
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Which two numbers should be interchanged to make the given equation correct?63 ÷ 21 - 42 + 8 × 7 = 135a)21 and 42b)21 and 8c)7 and 63d)7 and 21Correct answer is option 'D'. Can you explain this answer?
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