Choon yong was asked to paint a wall of area 84 meter square.In one hour,he had painted 21meter square.
a)what percentage of the wall was left unpainted?
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To find out the percentage of the wall that was left unpainted, we first need to calculate the area that was painted by Choon Yong.
In one hour, Choon Yong painted 21 square meters. Therefore, we can calculate the total number of hours it took him to paint the entire wall by dividing the total area of the wall (84 square meters) by the amount he painted in one hour (21 square meters).
Total number of hours = Total area / Area painted in one hour
Total number of hours = 84 square meters / 21 square meters
Total number of hours = 4 hours
So, Choon Yong took 4 hours to paint the entire wall.
Now, to find the percentage of the wall that was left unpainted, we need to calculate the remaining area of the wall.
Remaining area = Total area - Area painted
Remaining area = 84 square meters - 21 square meters
Remaining area = 63 square meters
To find the percentage, we need to divide the remaining area by the total area and multiply by 100.
Percentage of wall left unpainted = (Remaining area / Total area) * 100
Percentage of wall left unpainted = (63 square meters / 84 square meters) * 100
Percentage of wall left unpainted = (0.75) * 100
Percentage of wall left unpainted = 75%
Therefore, 75% of the wall was left unpainted.