the average of five numbers is 20. The average of the five numbers is 18 when one of the numbers is changed to 4. What is the original value of the changed numbers

the figure below is made up of 4 squares its perimeter is 40 cm . what is the area of one square ?

EX3:

One pack of pencils has fifteen pencils .four other pack have twenty pencils each .What is the total pencils in thoses five pack?

# 29. On a pond there are 16 water lily leaves in a 4 by 4 pattern as shown. A frog sits on a leaf
in one of the corners. It then jumps from one leaf to another either horizontally or vertically. The
frog always jumps over at least one leaf and never lands on the same leaf twice. What is the greatest
number of leaves (including the one it sits on) that the frog can reach?

Mary reads four books every month . She is busy and reads only one book on March . On september , she takes a break and does not read any books . What is the number of books that Anna reads in one year ?

One pack of pencils has fifteen pencils. Four other packs have twenty pencil each. What is the total pencils in these five packs?

the average of four number is 25 . the average of the four is 23 when one of the number changed to 6. what is the original value of the changed number ??

Mary reads four books every month. She is busy and reads only one book on March. On September, she takes a break and does not read any books. What is the number of books that Anna reads in one year?
Answer: She reads ......... books.