Question

please give me full solution of question number 7

Answer 1

ʜᴇʏ ᴍᴀᴛᴇ!!

ʜᴇʀᴇ's ᴜʀ ᴀɴsᴡᴇʀ ᴅᴇᴀʀ:-)

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ʟᴇᴛ ᴛʜᴇ ʟᴇɴɢᴛʜ, ʙʀᴇᴀᴅᴛʜ ᴀɴᴅ ʜᴇɪɢʜᴛ ᴏғ ᴛʜᴇ ᴄᴜʙɪᴏᴅ ʙᴇ 4x,2x ᴀɴᴅ x ʀᴇsᴘᴇᴄᴛɪᴠᴇʟʏ.

ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ǫᴜᴇsᴛɪᴏɴ ➡️

✔️ᴛᴏᴛᴀʟ sᴜʀғᴀᴄᴇ ᴀʀᴇᴀ = 2800ᴄᴍ^2

2(lb+bh+hl)= 2800

2{(4x)(2x)+(2x)(x)+(x)(4x)}= 2800

2(8x^2+2x^2+4x^2) = 2800

2(14x^2)=2800

14x^2=1400

$x {}^{2} = \frac{1400}{14} \\ \\ x = \sqrt{100} \\ x = 10$

So,

Length= 4x=4×10=40cm
Breadth = 2x=2×20=20cm
Height = x= 10 cm

Now,

Volume of cuboid = L× B ×H

➡️(40×20×10)cm ^2

➡️8000cm^2

ʜᴇɴᴄᴇ, ᴛʜᴇ ᴠᴏʟᴜᴍᴇ ᴏғ ᴄᴜʙᴏɪᴅ ɪs 8000ᴄᴍ^2.
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ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs:-)☺️☺️