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Math 1 100 Writing
(1) Assume that the per capita housing construction area of urban residents in Shandong Province in 2007 is x square meters.

29×( 1+ 1/29)=x

x=29×30/29

x=30

(2) If there are X pieces in 50 yuan, then there are 3x/5 = 0.6x pieces in 100 yuan.

50×x+0.6x× 100 = 1 100

50x+60x= 1 100

1 10x = 1 100

x= 10

0.6x=6

50 yuan 10, 100 Yuan 6.

(3) 700× (1-9/10) = 70 (μ g)

(4) 22 ÷ (1-9/20) = 22 ÷ (11/20) = 40 (mg)