Which two signs should be interchanged to make the below equation mathematically correct?
35 + 21 – 192 ÷ 32 × 7 = 154
- AOption (a)
× and –
- BOption (b)
÷ and –
- COption (c)
– and +
- DOption (d)
- and ÷
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Correct answer
× and –
Why this answer is correct
Here, we use the BODMAS table given below:
Given:
⇒ 35 + 21 - 192 ÷ 32 × 7 = 154
(1) × and -
⇒ 35 + 21 - 192 ÷ 32 × 7 = 154
After changing the signs:
⇒ 35 + 21 × 192 ÷ 32 - 7
Apply BODMAS rule:
⇒ 35 + 21 × 6 - 7
⇒ 35 + 126 - 7
⇒ 161 - 7 = 154
⇒ '35 + 21 × 192 ÷ 32 - 7 = 154'
Here, the equation is satisfied.
(2) ÷ and -
⇒ 35 + 21 - 192 ÷ 32 × 7 = 154
After changing the signs:
⇒ 35 + 21 ÷ 192 - 32 × 7
Apply BODMAS rule:
⇒ 35 + 0.109 - 32 × 7
⇒ 35 + 0.109 - 224
⇒ 35.109 - 224 = (-188.891)
Here, the equation is not satisfied.
(3) - and +
⇒ 35 + 21 – 192 ÷ 32 × 7 = 154
After changing the signs:
⇒ 35 - 21 + 192 ÷ 32 × 7
Apply BODMAS rule:
⇒ 35 - 21 + 6 × 7
⇒ 35 - 21 + 42
⇒ 77 - 21 = 56
Here, the equation is not satisfied.
(4) + and ÷
⇒ 35 + 21 – 192 ÷ 32 × 7 = 154
After changing the signs:
⇒ 35 ÷ 21 - 192 + 32 × 7
Apply BODMAS rule:
⇒ 1.66 - 192 + 32 × 7
⇒ 1.66 - 192 + 224
⇒ 225.66 - 192 = 33.66
Here, the equation is not satisfied.
Hence, the correct answer is "× and –".



















