Step-by-step explanation:
Fraction of work done by Gardner in 1 hr = 1 / 5
Fraction of work done by Gardner and helper in 1 hr = 1 / 4
Fraction of work done by helper in 1 hr
= 1 / 4 - 1 / 5
= 1 / 20
<u>Time required by helper to complete work</u> :
= <u>20 hours</u>
72 boys.
Step-by-step explanation:
no. of boys (initial) : no. of girls : no. of boys (final)
3 : 2
3 : 2
______________________________________
9 : 6 : 4
9u - 4u = 5u = 30
5u = 30
1u = 30/5 = 8
9u (initial no. of boys) = 8×9
= 72
Answer:
<h3>Children's books</h3>
- Number = c
- Cost of each = $5
- Total of children's books = 5c
<h3>Adult books</h3>
- Number = a
- Cost of each = $9
- Total of children's books = 9a
<h3>The equations reflecting the totals are</h3>
- Books ⇒ c + a = 500
- Total cost ⇒ 5c + 9a = 3940
There are a lot of solutions to this problem, so I'm only going to list 10. The only requirement is that the quadrilateral must be a rectangle with a perimeter of 120 meters.
1) 30, 30, 30, 30. I know that this is a square, but it should still be a solution since all squares are rectangles.
2) 50, 50, 10, 10.
3) 55, 55, 5, 5.
4) 45, 45, 15, 15.
5) 40, 40, 20, 20.
6) 35, 35, 25, 25.
7) 36, 36, 24, 24.
8) 18, 18, 52, 52.
9) 14, 14, 48, 48
10) 6, 6, 54, 54.
Answer:
units.
Step-by-step explanation:
In a triangle, centroid is the intersecting point of the medians.
Centroid divides each of the medians in ratio 
So,
Put 
units
units.
