24X+30×(X+0.44)=83.4
24X+ 13.2+30X =83.4
54X =83.4- 13.2
54X =70.2
X =70.2÷54
X = 1.3
1.3+0.44 = 1.74 (yuan) a: ———————
2. Solution: Let A have x kilograms and B have (12-x) kilograms.
( 12-X)×96- 132X=354
1 152-96X- 132 x = 354
228X = 1 152-354
228X= 1 152-354
X=798÷228
X=3.5
12-3.5=8.5 (kg) A: ——————
3. Solution: Let sunny days have X days and rainy days have (3+X) days.
16X- 1 1(3+X)= 27
16X- 1 1X-33 = 27
5X-33 =27
5X=27+33
x = 60 \5
X= 12
12+3 = 15 (days)
15+ 12 = 27 (days) A: ——
4.20×5= 100 (point)
100-76=24 (point)
24(5+ 1)= 4 (road)
20-4= 16 (Dao) a: ———————————
5. Solution: Let A play X, and B play (14-X).
A is missing (10-X), and B is missing 10-( 14-X)(X-4).
4X-( 10-X)×2-( 14-X)×5-(X-4)×3 = 10
4X-(20-2X)-(70-5X)-(3X- 12)= 10
(4X-20+2X)-(70-5X-3X+ 12)= 10
6X-20- (82-8X) = 10
6X-20-82+8X = 10
14X = 10+ 102
X = 1 12÷ 14
X 8 14-8=6 (F)
A: ————
6 solution: let Xiao Zhang's speed be x and Xiao Wang's speed be x- 1.5.
4 hours, Xiao Zhang walks for 3.5 hours and Xiao Wang walks for 3 hours and 20 minutes.
* * * Take 12 * 3 = 36km.
3.5x+(3+ 1/3) (note: it means walking for 3 hours and 20 minutes) *(x- 1.5)=36.
X= 6 kilometers per hour
Xiao Wang is 6-1.5 = 4.5 km/h.