75 and 32 / 25 times 16 and 25 / 16, simple calculation. Quick... Urgent

75 and 32 / 25 times 16 and 25 / 16, simple calculation. Quick... Urgent

75 and 25 out of 32 times 16 and 16 out of 25
=(75+25/32)(16+16/25)
=1200+25/2+48+1/2
=1248+13
=1261

How to do 22.32 + 0.25 + 0.75 with simple calculation

22.32+（0.25+0.75）

Simple calculation of 0.5 * 1.25 * 32
7.3 * 9.8 simple calculation

0.5*1.25*（4*8）=（0.5*4）*（1.25*8）=20
0.5*1.25*0.2*8=(0.5*0.2)*(1.25*8)=0.1*10=1
10.01*101-10.01=10.01*(101-1)=1001
4.6*3.1+3.1*5.4=3.1*(4.6+5.4)=31
0.8*（1.25+2）=1+0.16=1.16
2.99*4.2=(3-0.01)*4.2=12.6-0.042=12.558
10.1*1.5-0.15=(10+0.1)*1.5-0.15=15

(0.81 × 7.5 × 0.48) / (0.25 × 0.24 × 0.27) =? Calculated by a simple method

81 and 0.27, 7.5 and 0.25, 0.48 and 0.24, 3 * 30 * 2 = 180

If 5a-2b / a = 1 / 2, then B / a =?

If 5A = 3 / 2B, then a: B = (): ()

a:b=3/2:5=3:10

Known: 5A + 2B = 440, a + B = 100, how many unknowns A and B are each?

A+B=100
B=100-A
Substituting 5A + 2B = 440
5A+200-2A=440
3A=240
A=80
B=100-A=20

a: B = C: D = 1.8, and a + B + C + D = 12.6, where a: B = 18:5, then a = (); b = (); C = (); d = ()
Sorry, I read it wrong. It should be a: D = 18.5

There must be a wrong title on the book
Is it a: D = 18:5
In that case,
Let a = 18x, then B = 10x, C = 9x, d = 5x,
a+b+c+d=42x=12.6
We get x = 0.3
Then a = 5.4 B = 3 C = 2.7 d = 1.5

6,8,10,11,12,14,() A.15 B.16 C.17 D..18

The difference between 6 and 12 is 6
The difference between 8 and 14 is 6
The difference between 10 and 16 is 6, so choose B

If angel a: B = C: D = 1.8 and a + B + C + D = 12.6, where a: D = 18:5, then a = () B = () C = () d = ()
thank you!

Let d be X
c＝1.8x
a＝（18/5）x＝3.6x
b＝3.6x/1.8＝2x
3.6x＋1.8x＋x＋2x＝12.6
8.4x ＝12.6
x＝12.6/8.4
x＝1.5
d＝1.5
a＝1.5*（18/5）＝5.4
b＝5.4/1.8＝3
c＝1.5*1.8＝2.7