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In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many students are 10 years old?

User Galbarm
by
7.9k points

2 Answers

7 votes

Answer:

10 students

Explanation:

Given :-

50% younger than 10

1/20 (or 5%) are 10

1/10 (or 10%) are older than 10 but younger than 12

Remaining students = 100% - 50% - 10% - 5%

= 35%

= 70 students

Total students

=> 7T/20 = 70

=> 7T = 1400

=> T = 200

10 year old students

= T x 5%

= 200 x 1/20

= 10 students

User Ivelise
by
9.4k points
13 votes

Given :


50\%younger than
10


(1)/(20)(or 5%) are 10


(1)/(10) (or 10%) are older than 10 but younger than 12

☆Remaining students =
100\% -50\% - 10\% - 5\%

»
35\%

»
{{\bold{{{{{ \pink{70 \: students}}}}}}}}

☆Total students


(7 \: total)/(20) = 70


7 \: total = 1400


{{\bold{{{{{ \pink{total = 200}}}}}}}}

☆10 year old students


total * 5\%


200 * (1)/(20)


{{\bold{{{{{ \pink{10 \: students}}}}}}}}

User Jismon Thomas
by
7.7k points

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