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Answers to the eighth grade math book
(5) Solution: Suppose it takes X days to catch up with the slow horse.

240x =150 (x+12) 240x =150x+1800 90x =1800x = 20 (6) solution: let the first meeting be x minutes.

600x=400 X=2/3 seconds Time: 2/3*2=4/ 3 (7) Solution: Set X pigeon cages.

6x+3+5=8x

x=4

6x+3=27

A ***4 pigeon coops, 27 pigeons.

(8)

Solution: Let's assume that our daughter is now X years old and our father is now 9 1-x years old. According to this equality relation, the equation is established.

2x-(9 1-x)/3 =(9 1-x)-x

6x-9 1+x = 273-6x 13x = 364

x=28

My daughter is 28 years old now. Choose me. Choose me ~