The age of sudha was 5/2 times as old as her younger sister sumi in 2055 b. s. and the age of sudha will be 10 years less than twice the age of sumi in 2070 b. s. find the birth year of sumi.

The birth year of Sumi is

Step-by-step explanation:

Let

x------> the age of Sudha in 2055

y-----> the age of Sumi in 2055

we know that

-----> equation A

-----> equation B

Substitute equation A in equation B and solve for y

Find the value of x

The birth year of Sumi is

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.