The average height of 40 pencils is 154 cm. Some pencils of average height 160 cm are taken out. If the new average height is 150 cm, then how many pencils are remaining? *
Answers
Answered by
1
Answer:
16 pencils were removed so there are now 24 pencils left
Step-by-step explanation:
You have to find the percent value of the drop in average height then take that percent and apply it to the number 40 to find how many pencils were removed.
If 24pencils had average height of 150cm and 16 had average height of 160cm the total average would be 154cm so if you remove the 40% (16 pencils) then you get 24 pencils left with a average height of 150cm.
Similar questions