2) The average of a brother and sister was
35
years, at
5 years ago. What will be
their average age at present.

Step-by-step explanation:

Average age 5 years ago: 35

Sum of ages 5 years ago: 2(35), or 70

Sum of ages now: 70 + 2(5), or 70 + 10 = 80

Current average: 80/2 = 40

So, their average age is 40!

Hope this helps :)

their average present age should be 40

Step-by-step explanation:

they were 35, 5 yrs ago. just add the 5yrs to 35 yrs old and you will get their present age.

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.