180
60
25
20
Correct answer is D
Let x rep. numbers of boys that can work at \(\frac{5}{4}\) the rate at
which the 10 girls work
For 1 hrs, x boys will work for \(\frac{\frac{1}{5} \times 10}{4}\)
x = \(\frac{5}{4}\) x 10
= 8 boys
8 boys will do the work of ten girls at the same rate
4 + 8 = 12 bous cut the field in 5 hrs for 3 hrs,
\(\frac{12 \times 5}{3}\) boys will be needed = 20 boys.
Find the number of sides of a regular polygon whose interior angle is twice the exterior angle. ...
Find the slope of the curve y = 2x\(^2\) + 5x - 3 at (1, 4). ...
Simplify \(\frac{4\frac{3}{4} - 6\frac{1}{4}}{4\frac{1}{5} \text{ of } 1\frac{1}{4}}\)...
Simplify \(4 - \frac{1}{2 - \sqrt{3}}\)...
What is the value of x satisfying the equation \(\frac{4^{2x}}{4^{3x}}\) = 2?...
Arrange \(\frac{3}{5}\),\(\frac{9}{16}\), \(\frac{34}{59}\) and \(\frac{71}{97}\) in ascending ...
The diagram above is a rectangle. If the perimeter is 36m, find the area of the rectangle ...
How many different 8 letter words are possible using the letters of the word SYLLABUS? ...
In the diagram, find PQ if the area of triangle PQR is 35cm\(^2\)...