Mr. Wells runs a telecommunications company. While going through the company's project records, he found that there were 8 engineers under every team leader and 5 project managers for every 50 engineers. Mr. Wells currently employs 15 team leaders. How many project managers are employed by Mr. Wells?

12 project managers.

Step-by-step explanation:

There are 8 engineers for every team leader. So, since Mr. Wells employed 15 team leaders;

the number of engineers = 15 x 8

                                          = 120

There are 120 engineers in the project record.

There are 5 project managers for every 50 engineers. Then;

The number of engineers = 50 + 50 + 20

                                           = 120

So that,

The number of project managers = 5 + 5 +2

                                                       = 12

Therefore, Mr. Wells employed 12 project managers.

  5.   y=6; de=7; fg=8

  6.   x=4.2; jl=14.2; mn=13

step-by-step explanation:

when chords cross inside a circle, the product of the segment lengths is a constant.

5. dh×eh = fh×gh

  y = gh = dh×eh/fh = 3×4/2 . . . divide by the coefficient of gh

  y = 6

of course, the total chord length is the sum of the lengths of its segments.

  de = dh +eh = 3+4 = 7

  fg = fh +gh = 2+6 = 8

6. this problem works the same way as the previous one.

  x = lk = mk×nk/jk = 6×7/10 = 4.2

  jl = jk +lk = 10 +4.2 = 14.2

  mn = mk +nk = 6 +7 = 13

comment on chords and secants

you can think of the points h (problem 5) and k (problem 6) as points where the chords meet. a chord is part of a secant line, a line that intersects the circle in two points. one can also consider these points (h or k) to be the points where the respective secant lines meet.

then, the product that is a constant is the product of the distance from the meeting point (h or k) to one circle intersection with the distance from that meeting point to the other circle intersection. for problem 5, the constant is the product hd×he = hf×hg.

it turns out that this rule regarding the products of lengths to points of intersection is also true when the secants intersect outside the circle.

that is, you only need to remember one rule to work both kinds of problems.

.5 lb

step-by-step explanation:

12 in / 6 in =2 in

.25 x 2 = .5 lb