Question

A teacher tells the class that highest marks obtain by a student in her class is twice the lowest marks plus 7. if the highest marks is 87, what is the lowest mark

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Answer 1

Answer:

highest marks = twice the lowest marks +7

so, 87 =2 × x +7

=x = 87-7 ÷2

=x = 80÷2

=x= 40

Answer 2

Answer:

ʟᴇᴛ ᴛʜᴇ ʟᴏᴡᴇꜱᴛ ꜱᴄᴏʀᴇ ᴏʙᴛᴀɪɴᴇᴅ ʙʏ ᴀᴀ ꜱᴛᴜᴅᴇɴᴛ ʙᴇ " x " .

∴ ʜɪɢʜᴇꜱᴛ ꜱᴄᴏʀᴇ ᴏʙᴛᴀɪɴᴇᴅ ʙʏ ᴀᴀ ꜱᴛᴜᴅᴇɴᴛ = 2x + 7

ɴᴏᴡ , ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ Qᴜᴇꜱᴛɪᴏɴ

2x + 7 = 87

ᴛʀᴀɴꜱᴘᴏꜱɪɴɢ 7 ꜰʀᴏᴍ ԼӇՏ ᴛᴏ ƦӇՏ , ᴡᴇ ɢᴇᴛ

⇒ 2x = 87 - 7 ⇒ 2x = 80

ᴅɪᴠɪᴅɪɴɢ ʙᴏᴛʜ ꜱɪᴅᴇꜱ ʙʏ 2 , ᴡᴇ ɢᴇᴛ

⇒ 2x / 2 = 80/2 ⇒ x = 40

ʜᴇɴᴄᴇ , ᴛʜᴇ ʟᴏᴡᴇꜱᴛ ꜱᴄᴏʀᴇ ɪꜱ 40 .