Which quantity is unknown
1 answer:
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Given:
The inequality is
To find:
The mistake in the given solution and correct it.
Solution:
We have,
Isolating variable on one side, we get
On dividing both sides by -3, we get
Because if an inequality is multiplied or divided by a negative number, then the sign of inequality must be changed.
Therefore, there is a mistake in last step because the sign of inequality remains same after diving it by -3 and the correct solution is .