Question

The average weight of 20 boys in a class is 480kg and the average weight of 10 girls is 420kg. Find the average weight of the children in that class.

Answer 1

Answer:

900 kg

Step-by-step explanation:

480KG + 420KG

=900KG

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Answer 2

Qᴜᴇsᴛɪᴏɴ:

☞︎︎︎ The average weight of 20 boys in a class is 480kg and the average weight of 10 girls is 420kg. Find the average weight of the children in that class.

Sᴏʟᴜᴛɪᴏɴ:

Tᴏᴛᴀʟ ᴡᴇɪɢʜᴛ ᴏғ 20 ʙᴏʏs » $20 \times 29 = 580kg$

Tᴏᴛᴀʟ ᴡᴇɪɢʜᴛ ᴏғ 15 ɢɪʀʟs » $15 \times 22 = 330 \: kg$

Tᴏᴛᴀʟ ᴡᴇɪɢʜᴛ ᴏғ 20 ʙᴏʏs ᴀɴᴅ 15 ɢɪʀʟs $= (580 + 330) \: kg \: = 910 \: kg$

Tᴏᴛᴀʟ sᴛᴜᴅᴇɴᴛ $= 20 + 15 = 35$

Aᴠᴇʀᴀɢᴇ ᴡᴇɪɢʜᴛ ᴏғ ᴀʟʟ ᴛʜᴇ sᴛᴜᴅᴇɴᴛs ɪɴ ᴛʜᴇ ᴄʟᴀss $= 910 \div 35 = 26 \: kg$