Answer:
A) The time required to paint the entire room is 50 minutes .
B) The time required to paint the 64 % of entire room is 32 minutes .
Step-by-step explanation:
Given as :
After 18 minutes, 64% of the room still needs painted.
So. In 18 minutes , (100 % - 64 % = 36 %) of room painted
Let time required to paint entire room = T minutes
Now, According to question
A ) Applying unitary method
∵ 36 % of the entire room is painted in total time of 18 minutes
So, 1 % of the entire room is painted in total time of [tex]\dfrac{18}{36}[/tex] min
∴ 100% of the room is painted in [tex]\dfrac{18}{36}[/tex] × 100 minutes
i.e T = [tex]\dfrac{18\times 100}{36}[/tex]
Or, T = 50 min
So, The time required to paint entire room = T = 50 minutes
Hence, The time required to paint the entire room is 50 minutes . Answer
B ) Again
Time required to paint 64 % of entire room = x minutes
∵ 36 % of the entire room is painted in total time of 18 minutes
So, 1 % of the entire room is painted in total time of [tex]\dfrac{18}{36}[/tex] min
∴ 64% of the room is painted in [tex]\dfrac{18}{36}[/tex] × 64 minutes
i.e x = [tex]\dfrac{18\times 64}{36}[/tex]
Or, x = 32 min
So, The time required to paint entire room = x = 32 minutes
Hence, The time required to paint the 64 % of entire room is 32 minutes . Answer
