Question

The length of a rectangular Hall is 4m less than 3 times the bredth of the hall . what is te length, if the bredth is b metres​

Answer 1

$\LARGE\underline\mathfrak{AnSwEr:}$

ʟᴇɴɢᴛʜ ᴏғ ʀᴇᴄᴛᴀɴɢᴜʟᴀʀ ʜᴀʟʟ = (3ʙ -4)ᴍ

$\LARGE\underline\mathfrak{Step \: by \: step \: explanation:}$

ᴡᴇ ᴀʀᴇ ɢɪᴠᴇɴ ᴛʜᴇ ᴅɪᴍᴇɴsɪᴏɴs ᴏғ ᴀ ʀᴇᴀᴄᴛᴀɴɢᴜʟᴀʀ ʜᴀʟʟ, ʙʀᴇᴀᴅᴛʜ ɪs ʙ ᴍᴇᴛᴇʀs

sᴏ, ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ɢɪᴠᴇɴ ᴅᴀᴛᴀ :

ʟᴇɴɢᴛʜ ɪs 3ᴛɪᴍᴇs ᴛʜᴇ ʙʀᴇᴀᴅᴛʜ = 3ʙ ᴍ

ᴀʟsᴏ, 4 ʟᴇss ᴛʜᴀɴ ᴛʜᴇ ʙʀᴇᴀᴅᴛʜ :

sᴏ,ʟᴇɴɢᴛʜ ɪs = (3ʙ -4)ᴍ

➠${\boxed{\sf{Length \: = \: (3B -4)m}}}$

$\LARGE\underline\mathfrak{Extra \: knowledge:}$

• ɴᴏᴡ,ɪғ ᴀʀᴇ ɢᴏɪɴɢ ᴛᴏ ғɪɴᴅ ᴛʜᴇ ᴀʀᴇᴀ ᴏғ ʜᴀʟʟ ᴛʜᴇ ғᴏʀᴍᴜʟᴀ ᴡɪʟʟ ʙᴇ ;

➠ᴀʀᴇᴀ ᴏғ ʜᴀʟʟ = ʟᴇɴɢᴛʜ × ʙʀᴇᴀᴅᴛʜ

➠ᴀʀᴇᴀ ᴏғ ʜᴀʟʟ = (3ʙ -4)ʙ ᴜɴɪᴛs

• ᴏʀ,ɪғ ᴡᴇ ᴀʀᴇ ɢᴏɪɴɢ ᴛᴏ ғɪɴᴅ ᴘᴇʀɪᴍᴇᴛᴇʀ ᴛʜᴇɴ,ғᴏʀᴍᴜʟᴀ ᴡɪʟʟ ʙᴇ;

➠ᴘᴇʀɪᴍᴇᴛᴇʀ ᴏғ ʜᴀʟʟ = 2(ʟᴇɴɢᴛʜ + ʙʀᴇᴀᴅᴛʜ)

➠ᴘᴇʀɪᴍᴇᴛᴇʀ ᴏғ ʜᴀʟʟ = 2(3ʙ - 4 + ʙ) ᴜɴɪᴛs

Answer 2

Answer:

let breadth = b .

A.T.Q.

length = 3b-4 metres