Answer:
Option A is the correct answer.
Step-by-step explanation:
Let the work be W.
Ram can complete the work in 10 hours, Ajit in 12 hours and Suresh in 15 hours.
Ram had to leave the work after 2 hours of the start and Ajit left 3 hours before the completion of the work.
Let t be the time of work completion,
We have
Option A is the correct answer.
Answer:
B) identity property of addition.
Step-by-step explanation:
Given:
The statement given is:
Here, we observe that 10 is added to a giving the number 10 itself as the answer. So, we know of a property which says that when 0 is added to a number, the result is the number itself. This property is called identity property of addition.
So, the value of must be 0 because on adding
to 10, we are getting the number 10 only. So, the above statement is an example of identity property of addition.