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Question : Directions: Select the correct combination of mathematical signs to replace signs and balance the following equation.
21 * 7 * 6 * 9

Option 1: +, ÷, =

Option 2: ÷, +, =

Option 3: =, +, ÷

Option 4: ÷, =, +


Team Careers360 24th Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

Correct Answer: ÷, +, =


Solution : Given:
21 * 7 * 6 * 9

Let's check the options –
First option: +, ÷, =
⇒ 21 + 7 ÷ 6 = 9
Solving the L.H.S. of the equation –
= 21 + 7 ÷ 6
= 21 + 1.67
= 22.67 ≠ 9
Second option: ÷, +, =
⇒ 21 ÷ 7 + 6 = 9
Solving the L.H.S. of the equation –
= 21 ÷ 7 + 6
= 3 + 6
= 9 = R.H.S.
Third option: =, +, ÷
⇒ 21 = 7 + 6 ÷ 9
Solving the R.H.S. of the equation –
= 7 + 6 ÷ 9
= 7 + 0.67
= 7.67 ≠ 21
Fourth option: ÷, =, +
⇒ 21 ÷ 7 = 6 + 9
= 3 ≠ 15

So, only the second option satisfies the equation. Hence, the second option is correct.

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