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siniylev [52]
3 years ago
10

Petra started with a number added 3 multiplied the result by 4 subtracted 6 and multiplied that result by 3 her final answer was

90 what did she begin with?
Mathematics
1 answer:
dlinn [17]3 years ago
4 0
We don't know the number she started with, so let's call it x.

<span>Petra started with a number added 3: x + 3
</span>
<span>multiplied the result by 4: 4(x + 3)

</span><span>subtracted 6: 4(x + 3) - 6
</span>
<span>and multiplied that result by 3: 3[4(x + 3) - 6]
</span>
her final answer was 90: <span>3[4(x + 3) - 6] = 90

Now we solve the equation for x.

</span><span>3[4(x + 3) - 6] = 90
</span>
<span>4(x + 3) - 6 = 30

4(x + 3) = 36

x + 3 = 9

x = 6

The number is 6.
</span>
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