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: ÷, =, +
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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