Answer:
cost of 5 story book=800
cost of 1 story book=800/5
=160
how many. book can be bought on rs.1400
=1400/160
=8.75
Step-by-step explanation:
=
Answer:
x = 7
Step-by-step explanation:

Answer: It is an associative property of addition.
Step-by-step explanation:
Since we have given that
(4+6.1)+7=4+(6.1+7)
As we know that "Associative property":

Associativity in addition means that adding three numbers and then change the order of numbers and then add it again, we will get the same answer.
So,

Hence, it is an associative property of addition.