Sugar is 1 / 4 of water

Sugar is 1 / 4 of water

That's right. Sugar accounts for one fifth of sugar water, which means that sugar water is divided into five parts, sugar accounts for one part, then water accounts for four parts, so it's right to say that sugar accounts for one fourth of water

The weight of water is 9 times that of sugar

Yes

Dissolve 5g sugar into 50g water, sugar accounts for (). Take 6 apples as unit "1", divide them into 3 parts averagely, and each part is a few apples; divide them into 9 parts averagely, and each part is a few apples

1/11

How to calculate x ^ 2-5x + 4 = 0 with the root formula

Cross multiplication
（x-1）（x-4）=0
X = 1 or x = 4
quadratic formula
x=（-b±√b²-4ac）/2a=（5±√（-5）²-4×1×4）/2×1
So x = 1 or x = 4

1 / 5x + 1 / 5x + 15 + 75 = x,

1/5X+1/5X+15+75=X
x-2/5x=90
3/5x=90
x=90×5/3
x=150

X + 1.5x = 75, how to calculate?

2.5x=75
x=30

How to calculate 300X × 80% = 300 × (x-1) × 90%

300x×80%=300×（x-1）×90%
240x=270)x-1)
240x=270x-270*1
transposition
270x-240x=270*1
30x=270
x=270÷30
x=9

Solving equation: (x + 960) times 80% = x-832

Simplified: 0.8x + 768 = x-832
2 x = 832 + 768
x=8000

(X+960)*0.8=X-832

0.8X+768=X-832
0.2X=1600
X=8000

X - (x + 960) * 80% = 832 x cannot be negative

x-(x+960)*80%=832 x-80%x-768=832 0.2x=1600 x=8000