= 18+ 1/20
= 18 and 1/20
2. Let the odd numbers removed be A and a+32.
Then1+3+5+7+... 49-a-(a+32) = 24 and 1 1/23*23.
625-32-2a=563
A= 15 The other even number is 47.
3. The total length is x kilometers.
( 1/70x+40)*50=x
x=7000
4.a/b= 15/7 means 7a= 15b.
(a+ 12)/b=9，a=9b- 12。
So a= 15/4 b=7/4.
5. let the subtrahend be x.
Negative+negative+difference =2 (negative+difference)
So 2(x+x/(3/4))=280.
x=60
6. If the second workshop is X, then the first workshop is 4/5x-30.
3/4(x- 10)= 4/5x-30+ 10
x=550
Workshop 1 4 10
7. Set the distance of x kilometers.
A drives x+ 120 and B drives 2x- 120.
At the same time, the distance is proportional to the speed.
(x+ 120)/(2x- 120)= 7:9
x=384
8. Warehouse B is X and Warehouse A is x+9 1.2.
x*(65%-35%)=9 1.2
x=304
A warehouse 395.2.
9. pour out v cubic centimeters
Its height is V/72 in a square volume and V/48 in a cylindrical volume.
The height of residual water per square volume is 30v/72.
30 volts /72 = 5 volts /48
V=864 cubic centimeters
The divisors of 10 and 1690 are 2,5, 13 and 13.
The common factor of two numbers is 13, so these two numbers may be 2* 13 and 5* 13 or 2*5* 13 and 13.
Namely 26 and 65 or 130 and 13.
1 1, the title is unclear.
B where does it go from b?