The average height of 3boys and 2girls is1.5metres the average height of the 2 of the boys is 1.6 find the height of the 3rd boy
Let's assume the height of the 3rd boy as X.
The total height of the 3 boys and 2 girls is 5 * 1.5 = 7.5 meters.
The total height of the 2 boys is 2 * 1.6 = 3.2 meters.
The height of the 3rd boy is 7.5 - 3.2 = 4.3 meters.
Therefore, the height of the 3rd boy is 4.3 meters.
To find the height of the 3rd boy, we first need to find the total height of all 3 boys.
The average height of the 3 boys and 2 girls is 1.5 meters. Since there are 3 boys and 2 girls, the total number of people is 3 + 2 = 5.
To find the total height of all 3 boys, we can multiply the average height (1.5 meters) by the total number of people (5).
Total height of all 3 boys and 2 girls = Average height * Total number of people
= 1.5 meters * 5
= 7.5 meters
Now, we know that the average height of the 2 of the boys is 1.6 meters. Let's say the heights of these two boys are B1 and B2.
Therefore, B1 + B2 = Average height of the 2 boys * Number of boys
= 1.6 meters * 2
= 3.2 meters
To find the height of the 3rd boy, we can subtract the sum of the heights of the two boys (B1 + B2) from the total height of all 3 boys and 2 girls.
Height of 3rd boy = Total height of all 3 boys and 2 girls - Sum of the heights of the 2 boys
= 7.5 meters - 3.2 meters
= 4.3 meters
Therefore, the height of the 3rd boy is 4.3 meters.