Question

9. The length of a ribbon is reduced to 40 cm from 50 cm after taking a 10 cm piece from it. Find the
percentage decrease in the length of the ribbon.​

Answer 1

Answer:

20%

Step-by-step explanation:

Decreased =10/50)*100=1000/50=20%

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Answer 2

$\large{ \bold{ \underline{ ᴜɴᴅᴇʀsᴛᴀɴᴅɪɴɢ \: ᴛʜᴇ \: ǫᴜᴇsᴛɪᴏɴ}}}$

➡ʜᴇʀᴇ , ᴛʜᴇ ǫᴜᴇsᴛɪᴏɴ sᴀʏs ᴛʜᴀᴛ ᴛʜᴇ ʟᴇɴɢᴛʜ ᴏғ ᴀ ʀɪʙʙᴏɴ ᴡᴀs 50 ᴄᴍ ᴀɴᴅ ɪᴛ ᴡᴀs ʀᴇᴅᴜᴄᴇᴅ ᴛᴏ 40 ᴄᴍ ᴀғᴛᴇʀ ᴛᴀᴋɪɴɢ 10 ᴄᴍ ᴘɪᴇᴄᴇ ғʀᴏᴍ ɪᴛ . ᴡᴇ ɴᴇᴇᴅ ᴛᴏ ғɪɴᴅ ᴛʜᴇ ᴘᴇʀᴄᴇɴᴛᴀɢᴇ ᴅᴇᴄʀᴇᴀsᴇᴅ ɪɴ ʟᴇɴɢᴛʜ ᴏғ ʀɪʙʙᴏɴ ..

$\large{ \bold{ \underline{ɢiven}}}$

➡ ᴏʀɪɢɪɴᴀʟ ʟᴇɴɢᴛʜ = 50 ᴄᴍ

➡ ɴᴇᴡ ʟᴇɴɢᴛʜ = 40 ᴄᴍ

➡ ʟᴇɴɢᴛʜ ᴄᴜᴛ ғʀᴏᴍ ɪᴛ = 10 ᴄᴍ

$\large{ \bold{ \underline{ᴛᴏ \: ғɪɴᴅ }}}$

➡ᴘᴇʀᴄᴇɴᴛᴀɢᴇ ᴅᴇᴄʀᴇᴀsᴇᴅ ɪɴ ᴛʜᴇ ʟᴇɴɢᴛʜ ᴏғ ʀɪʙʙᴏɴ

$\large{ \bold{ \underline{ᴄᴏɴᴄᴇᴘᴛ \: \: ᴜsᴇᴅ}}}$

$➡ \frac{decreased \: percentage}{original \: percentage} \times 100$

$\large{ \bold{ \underline{solution}}}$

$➡ \frac{10}{50} \times 100$

➡ 20%

ʜᴇɴᴄᴇ,

ᴛʜᴇ ᴘᴇʀᴄᴇɴᴛᴀɢᴇ ᴅᴇᴄʀᴇᴀsᴇᴅ ɪɴ ʟᴇɴɢᴛʜ ᴏғ ʀɪʙʙᴏɴ ɪs 20%

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