How much is 1 = 5, 2 = 10, 3 = 20, 4 = 40 and 5?

How much is 1 = 5, 2 = 10, 3 = 20, 4 = 40 and 5?

1＝5
5＝1

1. 5 is 40 ()% 2, 3 is more than 2 ()% 3, 4 is less than 5 ()%
1. 5 is ()% of 40
2. 3% more than 2%
3. 4% less than 5

12.5%
50%
25%

If 1 = 20 2 = 40 3 = 60 4 = 80 60 =?

3

In 1.2.3.4 How many of these 40 numbers can be taken out, so that any two numbers can be taken out

How many numbers can be taken out of the 40 numbers from 1.2.3. To 40, so that the sum of any two numbers taken out is not equal to the number taken out
answer:
40 39 38 37 36 35 34 33 32 31
30 29 28 27 26 25 24 23 22 21 20
21

One, three, four, six, twenty-four?

6÷[1－﹙3÷4﹚]=24

10,4,1,6, 24

10*（4-1）-6
= 30 -6
=24

Simple operation of 3.5 * 1.2 + 0.35 * 88

3.5*1.2+0.35*88
=0.35*12+0.35*88
=0.35*(12+88)
=0.35*100
=35

Simple calculation of 1.9 * 8.8-0.88

1.9*8.8-0.88
1.9*8.8-0.1*8.8
1.8*8.8=15.84

How to calculate 5.28 + 3.52 △ 0.88
RT
Bonus points!

(5.28+3.52)÷0.88
=8.80÷0.88
=10

Simple operation of 1 / 2 + 1 / 6 + 1 / 12 +... + 1 / 72

Original formula = (1-1 / 2) + (1 / 2-1 / 3) + (1 / 3-1 / 4) +. + (1 / 8-1 / 9)
=1-1/9=8/9