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men : 4u – 3u = 1u
women : 2p – 1p = 1p

4u + 2p ——- 400
2u + 1p ——- 200
1u + 80 ——- 1p
2u + 1u + 80 = 3u + 80 ——- 200
1u ——- (200 – 80)/3 = 40
4u ——- 160

Ans : 160 men.

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I did it in this way but too hard for her to understand. Abit short cut too. 

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First, apart from using the assumption method, the units drawn for men and women should not be assumed equal as the question did not state so. You may have confused her thus. Next, there would be a total of 8 units after subdividing the two units drawn for women, how is the 10 units being arrived? You may have confused her further. Last, you did not make use of any of these three pieces of information given : 3/4, 50% and 80  more. How could she not be confused?

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  1. Ic. Thank you. Will explain ur method by using model for easy understanding. 
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Hi ,

I dun understand how to explain 

Y there is 2U + 1P. 

Where Is this 2U come from ? 

 

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4u + 2p ——- 400

By dividing the above by 2, (4u/2) + (2p/2) ——- (400/2)

we get : 2u + 1p ——- 200

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