Question

The teacher tells the class that the highest mark obtained by a student in her class is twice the lowest marks plus 7. The highest mark is 87. What is the lowest mark?

Answer 1

here . hope it helps.

Answer 2

Answer:

ʜɪɢʜᴇꜱᴛ ꜱᴄᴏʀᴇ ᴏʙᴛᴀɪɴᴇᴅ ʙʏ ᴀ 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 .