Question

7. The average age of 30 boys of a class is
equal to 14 yr. When the age of the class
teacher is included the average becomes
15 yr. The age of the class teacher is
(1) 40 yr
(2) 42 Yr
(3) 48 yr
(4) 45 yr​

Answer 1

Answer:

45

Step-by-step explanation:

the age of teacher is 45

Answer 2

) ʏʀs ɪs ʏʀ ᴀɴsᴡᴇʀ

Step-by-step explanation:

ᴛʜᴇ ᴀᴠᴇʀᴀɢᴇ ᴀɢᴇ ᴏғ ʙᴏʏs ᴏғ ᴄʟᴀss ɪs ᴇǫᴜᴀʟ ᴛᴏ ʏʀs:

ɪ.ᴇ sᴜᴍ ᴏғ ᴀʟʟ ʙᴏʏs:*

ɪɴᴄʟᴜᴅᴇ ᴄʟᴀss ᴛᴇᴀᴄʜᴇʀ: ᴄᴀɴᴅɪᴅᴀᴛᴇs ɪɴ ᴄʟᴀss & ᴀᴠᴇʀᴀɢᴇ ᴀɢᴇ ɪs ʏʀs

ɪ.ᴇ sᴜᴍ ᴏғ ᴀʟʟ:*(ɪɴᴄʟᴜᴅᴇ ᴄʟᴀss ᴛᴇᴀᴄʜᴇʀ)=

sᴏ ᴛʜᴇ ᴀɢᴇ ɪs ᴏғ ᴄʟᴀss ᴛᴇᴀᴄʜᴇʀ ɪs : - = ʏʀ ᴀɴsᴡᴇʀ ᴡɪʟʟ ʙᴇ ʏʀ ( ᴏᴘᴛɪᴏɴ ) )