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Select the correct combination of mathematical signs that can sequentially replace the * signs and make the equation correct.

68 * 138* 23 * 54 * 20


1. +, ÷, −, =
2. ×, +, −, =
3. =, ×, +, ÷
4. ×, +, =, ÷

1 Answer

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Correct Answer - Option 1 : +, ÷, −, =

1. +, ÷, −, =

Given equation: 68 * 138* 23 * 54 * 20

After replacing the * by the symbols in the option, we get:

68 + 138 ÷ 23 - 54 = 20

⇒ 68 + 6 – 54 = 20

⇒ 74 – 54 = 20

⇒ 20 = 20

2. ×, +, −, =

Given equation: 68 * 138* 23 * 54 * 20

After replacing the * by the symbols in the option, we get:

68 × 138 + 23 - 54 = 20

⇒ 9384 + 23 – 54 = 20

⇒ 9407 – 54 = 20

⇒ 9353 ≠ 20

3. =, ×, +, ÷

Given equation: 68 * 138* 23 * 54 * 20

After replacing the * by the symbols in the option, we get:

68 = 138 × 23 + 54 ÷ 20

⇒ 68 = 3174 + 2.7

⇒ 68 ≠ 3176.7

4. ×, +, =, ÷

Given equation: 68 * 138* 23 * 54 * 20

After replacing the * by the symbols in the option, we get:

68 × 138 + 23 = 54 ÷ 20

⇒ 9384 + 23 = 2.7

⇒ 9407 ≠ 2.7

Hence, ‘+, ÷, −, =’ is the correct answer.

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