To Find the Fraction of the rectangle Arun painted blue,we can substract the fractions of green and red from the whole.
Arun painted:
5/8 of the rectangle green
1/4 of the rectangle red
since the whole rectangle is 1 ,we can substract the green and red parts from 1 to find the blue part
1-(5/8 + 1/4)
First we need to find a common denominator for the fractions, the common denominator is 8,so we convert _1/4 a to 2/8:
1 - ( 5/8+2/8)
so, 1- 7/8
Subtracting the fractions give us the blue part
1/8
so ,Arun painted the 1/8 of the rectangle blue.