3 / 5 of a number is 9 / 10. What's the number?

9 / 10 divided by 3 / 5 = 3 / 2
It's three out of two. If you change it into a fraction, it's one out of two

RELATED INFORMATIONS

1. 1. Three fourths of a number is 15. What's nine tenths of it? 2. One third of a number is equal to two fifths of three fourths Please make a formula
2. What is the sum of a number and 3 / 10, which is equivalent to 45% of 7 / 9
3. ）1 / 90, (), (). Find the rules and fill in the numbers!
4. Using the equation, 20% of 7 / 8 is equivalent to 14 / 15 of a number. What is the number
5. 14 out of 15 × 8 = (7 + 1) × 14 out of 15 (important process)
6. A times b equals 400. If a times 3, what's the product? If B divided by 5, what's the product?
7. The ratio is 58:15 / 16
8. (3.91 + 3 3 / 7 + 6.09 + 6 / 7) * (1 / 8-1.125) + (1 / 3-1.5) × 6.04 algorithm
9. 4 times a number minus 34.5 divided by 2.5, the difference is 16.2, find this number
10. An old man said that if you add 17 to his age, divide it by 4, subtract 15 and multiply it by 10, you will be 100 years old. How old is the old man
11. 4 / 5 of a number is 2 / 3 of 36. How much is this
12. (1) how many meters is 15% more than 36 meters? (2) how many meters is 15% less than 36 meters? (3) how many meters is one fourth more than 36 meters? (4) How many meters is one fourth less than 36 meters?
13. 5 of 6.5-2 =? 3 of 7 times 2.1 equals? 3-1 and 5 of 8 equals? 80% + 1 of 5 equals? 2 of 3-50% equals? 4 of 7 divided by 80%?
14. (1) 14-50% of 9 / 2-5 / 1 (2) 7 × 80% - 1 × 80% - 0.25 × 80% of 8 / 8
15. 1. (7 + 4 √ 3) (2 - √ 3) ^ 2 2. √ (1 / 25) ^ 2 - (2 / 5) ^ 2 3. √ 80 * √ 5 - √ 50 * √ 2 4. √ 4 / 3 ÷ 3 / 2 * √ 9 / 8
16. Fill in the numbers according to the rules: 89, 23, 12______ 、932、______ ．
17. What is the number of line 8 of the Leibniz triangle from the third position on the left?
18. What is the third number on the left of the tenth line of the Leibniz triangle?
19. What is the number in the third position from the left of line 40 of the Leibniz triangle? Hope to be able to give reasons
20. The famous Leibniz triangle in the world, as shown in the figure, is the number in the eleventh row from the right to the third position? Fig.1/1 1/2 1/2 1/3 1/6 1/3 1/4 1/12 1/12 1/4 1/5 1/20 1/30 1/20 1/5 1/6 1/30 1/60 1/60 1/30 1/6 1/7 1/42 1/105 1/140 1/105 1/42 1/7 . Find the number in the eleventh row from the right to the third position