Question

հҽվ!! ցմվ's ցմժ ҽѵҽ♡



ɪɴ ᴀ ꜱᴄʜᴏᴏʟ 50% ᴏꜰ ᴛʜᴇ ꜱᴛᴜᴅᴇɴᴛꜱ ᴀʀᴇ ʏᴏᴜɴɢᴇʀ ᴛʜᴀɴ 10, 1/20 ᴀʀᴇ 10 ʏᴇᴀʀꜱ ᴏʟᴅ ᴀɴᴅ 1/10 ᴀʀᴇ ᴏʟᴅᴇʀ ᴛʜᴀɴ 10 ʙᴜᴛ ʏᴏᴜɴɢᴇʀ ᴛʜᴀɴ 12, ᴛʜᴇ ʀᴇᴍᴀɪɴɪɴɢ 70 ꜱᴛᴜᴅᴇɴᴛꜱ ᴀʀᴇ 12 ʏᴇᴀʀꜱ ᴏʀ ᴏʟᴅᴇʀ. ʜᴏᴡ ᴍᴀɴʏ ꜱᴛᴜᴅᴇɴᴛꜱ ᴀʀᴇ 10 ʏᴇᴀʀꜱ ᴏʟᴅ?


sᴘᴀᴍ ✔xᴅxᴅ​

Answer 1

Let us write the fraction for each group of students.

Group A:

10:50%=50√100= 1√2

Group B:

10 years old: 1/20

Group C:

Older that 10 but younger than 12: 1/10

Group D:

12 years or older : 70 students

The fraction for group A, B and C together is given by..

1/2+1/20+1/10=10/20 +1/20+2/20= 13/20

(Common denominator)

The fraction for group D is given by..

20/20 – 13/20 = 7/20

and corresponds to 70 students..

If X is the total number of students, then..

→ 7/20 of X = 70

or (7/ 20) × X = 70

Solve for X

X = 70×(20/7)= 200

(20/7)= 200

Students who are 10 years old have a fraction of 1/ 20 of the total X and their number is equal to.

(1/20) of 200 = 10 students.

Answer 2

Step-by-step explanation:

SOLUTION

Let us write the fraction for each group of students..

Group A :

10: 50\% = 50 \sqrt{100 \: } = 1 \sqrt{2}10:50%=50100=12

\begin{gathered} \\ \end{gathered}

Group B : 10 years old: 1/20

\begin{gathered} \\ \end{gathered}

Group C : older that 10 but younger than 12: 1/10

\begin{gathered} \\ \end{gathered}

Group D : 12 years or older : 70 students

\begin{gathered} \\ \end{gathered}

The fraction for group A, B and C together is given by..

\begin{gathered} \\ \end{gathered}

1 / 2 + 1 / 20 + 1 / 10 = 10 / 20 + 1 / 20 + 2 / 201/2+1/20+1/10=10/20+1/20+2/20

, common denominator

\begin{gathered} \\ \end{gathered}

= 13 / 20 =13/20 

, add numerators

\begin{gathered} \\ \end{gathered}

The fraction for group D is given by..

\begin{gathered} \\ \end{gathered}

20 / 20 - 13 / 20 = 7 / 2020/20−13/20=7/20

and corresponds to 70 students..

\begin{gathered} \\ \end{gathered}

If X is the total number of students, then..

7 / 20 of X = 70

or (7 / 20) × X = 70

Solve for X

X = 70 × (20 / 7) = 200X=70×(20/7)=200

Students who are 10 years old have a fraction of 1 / 20 of the total X and their number is equal to..

(1 / 20) \: of \: 200 = 10 \: students(1/20)of200=student