Question

sundram got 19 out of 25 marks in a test what percentage marks he get

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Answer 1

ɪ'ᴍ ɢᴏɪɴɢ ᴛᴏ ᴇxᴘʟᴀɪɴ ᴄᴏɴᴄᴇᴘᴛs ᴛʜᴀᴛ ᴍɪɢʜᴛ ʙᴇ ᴜsᴇғᴜʟ ғᴏʀ ᴛʜɪs ǫᴜᴇsᴛɪᴏɴ ᴀɴᴅ ᴀʟᴍᴏsᴛ ᴀʟʟ ǫᴜᴇsᴛɪᴏɴs ɪɴ ᴡʜɪᴄʜ ᴛᴡᴏ ᴘᴀʀᴀᴍᴇᴛᴇʀs ᴀʀᴇ ʀᴇʟᴀᴛᴇᴅ ᴅɪʀᴇᴄᴛʟʏ ᴏʀ ɪɴᴅɪʀᴇᴄᴛʟʏ.

ɪғ ᴛᴡᴏ ᴘᴀʀᴀᴍᴇᴛᴇʀs ᴀʀᴇ ᴅɪʀᴇᴄᴛʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴ ᴛʜᴇɴ sᴛᴀʀᴛ sᴏʟᴠɪɴɢ ᴀs ғᴏʟʟᴏᴡs :

20 25

x 35

ɴᴏᴡ ᴄʀᴏss ᴍᴜʟᴛɪᴘʟʏ ᴀɴᴅ ᴇǫᴜᴀᴛᴇ ᴀs ғᴏʟʟᴏᴡ

x *25 = 20 * 35 => x = 28

ɴᴏᴡ sᴜᴘᴘᴏsᴇ ᴡᴇ ʜᴀᴅ ᴛᴡᴏ ᴘᴀʀᴀᴍᴇᴛᴇʀs ɪɴᴠᴇʀsᴇʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴᴀʟ ᴛᴏ ᴇᴀᴄʜ ᴏᴛʜᴇʀ, ᴛʜᴇɴ ᴍᴜʟᴛɪᴘʟʏ ʜᴏʀɪᴢᴏɴᴛᴀʟʟʏ ᴀs ғᴏʟʟᴏᴡs :

1sᴛ ᴘᴀʀᴀᴍᴇᴛᴇʀ 2ɴᴅ ᴘᴀʀᴀᴍᴇᴛᴇʀ

ᴀ ʙ

ᴄ ᴅ

ᴡᴇ ʜᴀᴠᴇ ғᴏʟʟᴏᴡɪɴɢ ʀᴇʟᴀᴛɪᴏɴsʜɪᴘ. .

ᴀ*ʙ = ᴄ * ᴅ

sᴏ ɪғ ᴡᴇ ᴀʀᴇ ɢɪᴠᴇɴ ᴀɴʏ ᴛʜʀᴇᴇ ᴠᴀʟᴜᴇs, ᴡᴇ ᴄᴀɴ ᴄᴀʟᴄᴜʟᴀᴛᴇ ғᴏᴜʀᴛʜ ᴏɴᴇ. ᴇ.ɢ

ɴᴏ. ᴏғ ᴡᴏʀᴋᴇʀs ᴀɴᴅ ɴᴏ ᴏғ ᴅᴀʏs ᴀʀᴇ ɪɴᴠᴇʀsᴇʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴᴀʟ ᴛᴏ ᴇᴀᴄʜ ᴏᴛʜᴇʀ

sᴏ ᴡᴇ ᴄᴀɴ ᴜsᴇ ᴀʙᴏᴠᴇ ғᴏʀᴍᴜʟᴀ ᴛᴏ sᴏʟᴠᴇ sᴜᴄʜ ᴘʀᴏʙʟᴇᴍs.