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: ÷, =, +
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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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