First look at the factors of 140
140: 1,2,4,5,7,10,14,20,28,35,70,140
35 + 4= 39
35 x 4= 140
Answers are 35 and 4
The answer is D
Have you ever heard of rise over run rise/run
Y/x. Well in this case the run is One with a rise of four
There are 490 workers
3/4 = 210/x
Cross multiply, 210x4 and 3x
You're then left with 3x = 840, divide both sides by 3
This answer is 280 and represents the amount of female workers
Then just add 210 and 280, your answer is 490. Hope that helps!
