What is the percent increase from $15 to$21
1 answer:
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Answer:
The unknown number is 12.
Step-by-step explanation:
Let the unknown number be 'x'
Given:
A number increased by 5 is equivalent to twice the same number decreased by 7.
So, 'x' increased by 5 means add 5 to 'x'. This gives
Now, is equivalent to twice of 'x' decreased by 7.
Twice of 'x' means 2 times of 'x' which is
'2x' decreased by 7 means subtract 7 from '2x'. This gives,
Now, and
are equivalent meaning they are equal. So,
Therefore, the unknown number is 12.