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28.12.2020 •
Mathematics
Ayushi has 100 pens and pencils altogether. 20% of them are pens. She buys some more pens and the percentage of the pens increases to 50%. How many pens did she buy? A. 30 B. 50 C. 60 D. 80
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Ответ:
The number of pens she bought is 30.
The first step is to determine the number of pens she has.
Number of pens she has = 20% x 100
= 0.2 x 100 = 20
The second step is to determine the number of pens she bought. This equation can be used to determine the
(x - 20) / 20 = 0.5
Where x is the number of pens she bought.
x - 20 = (0.5 x 20)
x - 20 = 10
x = 20 + 10
x = 30
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Ответ:
Step-by-step explanation:
Ответ:
the complete question in the attached figure
we have
if sixth graders own > 30and sixth graders own > 5%then > 5% > 100%x=100*30/5=600the answer is the total sixth graders surveyed were 600