# A store has sold 90 notebooks, which is 20% of all the notebooks they had. How many notebooks did the store have at first?

2
by gaeasuper541

2014-11-19T17:05:26+08:00

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There are 90 notebooks, they represent 20% of the total notebooks they had.
So divide 90 by 20%

90/20%
90/.2
=450

Therefore they had a total number of 450 notebooks.

Hope this helps =)
2014-11-22T16:03:17+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Simply just divide 90 and 20%

Sample

90/20%

20% will be 20/100 or simply .2

90/(20/100)

Get the reciprocal of 20/100 and multiply it to 90

90 * 100/20

9000/20

Divide

450

Therefore the store had 450 notebooks in total first

I hope it helps