() 16 = () 15 / 12 = 0.75 = 21 / 12 () (15) 16 = (15 / 16) = 0.75 = 21 △ 12 = 21 / 12 is wrong

() 16 = () 15 / 12 = 0.75 = 21 / 12 () (15) 16 = (15 / 16) = 0.75 = 21 △ 12 = 21 / 12 is wrong

(12) 16 = (15 / 20) = 0.75 = 21 ÷ (28) = 9 / 12

(): 16 = 0.75 = 15 of a fraction = ()%

(12) : 16 = 0.75 = (15 / 20) = (75)%

() ratio 16 = 0.75 = 6 △ () = 15 parts
The solution equation: 4 / 3-4x-1 / 6 x by 5 / 8 by 5 / 6 = 150 (1-4 / 7) x = 6 / 11

(12) Ratio 16 = 0.75 = 6 ÷ (8) = 15 / 20
solve equations:
4/3-4x=1/6
4x=4/3-1/6
4x=7/6
x=7/24
X times 5 / 8 times 5 / 6 = 150
x*25/48
x=150*48/25
x=288
（1-4/7）x=6/11
3/7x=6/11
x=6/11*7/3
x=14/11

16 to x = 0.75 to 15 / 8

16: X = 0.75:15 / 8
75X = 15 / 16 × 8
0.75x=30
x=30÷0.75
x=40

() / 8 = 15 of a fraction = 0.75 = ()% = ()

(6) / 8 = 15 / 20 = 0.75 = (75)% = (3 / 4)

(): 8 = quarter () = 0.75 = 15: ()

(6) : 8 = quarter (3) = 0.75 = 15: (20)
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75 = () 15 = 36 () = 15 △ ()

0.75 = (20) 15 = 36 (27) = 15 (20)

15 out of 20 = 0.75 = 21; process

Proof: 15 out of 20 is 15 / 20
15 / 20 = 3 / 4 (numerator and denominator divided by 5 at the same time)
3 / 4 = 0.75 (this is no problem)
3 / 4 = 0.75 = 21 (12 hours a day, divided into 4 parts, each 4 hours, namely 3:00, 6:00, 9:00, 12:00)
3 / 4 of 12 hours is 12 * 3 / 4 = 9:00
9:00, in 24 hours, 9:00 in the evening is 21:00, so 3 / 4 = 0.75 = 21

0.75=15/( )=( )/36=15 1/4＞( )＞1/5
75 = 15 / (20) = (27) / 36 = 15 divided by ()

0.75=3/4
The numerator and denominator are 5 at the same time
3*5/4*5=15/20
Then multiply the numerator and denominator by 9 at the same time to get
3*9/4*9=27/36
1/4=1*15/4*15=15/60
1/5=1*12/5*12=12/60
That is, the middle items can be filled in 13 / 60 and 14 / 60

（-60）÷（3/4+5/6-11/15-7/12）=?

＝－60／〔（9＋10－7）／12－11／15〕＝－60／〔（15－11）／15〕＝－60＊15／4＝－225