How to solve the equation 15 / y * x = 25 / 3 / X * y?

15/y*x=(25/3)/x*y,
∴(x/y)^2=5/9,
Ψ X / y = soil √ 5 / 3

Simple calculation of 7 / 2 - (1 / 2 + 1 / 25) - 23 / 50 and (5 / 4 × 2 / 3 + 3 / 4 × 2 / 3) △ 2 / 3 and (1 / 15 + 2 / 17) × 15 × 17 to solve equation 8 (X-2) = 2 (x + 7)
In order to solve the problem of Yushu earthquake relief, five classes in Grade 6 donated 8500 yuan in total, including 1650 yuan for class 1, 250 yuan for class 2 more than Class 1, 20% for class 3, and 2:3 for class 4 and class 5, Find the number of donations in class four (2) a two-tier bookshelf. The books on the upper shelf are two times as many as the books on the lower shelf, and there are 30 more books on the upper shelf than the books on the lower shelf

7/2-(1/2+1/25)-23/50=7/2-1=2.5
(5/4×2/3+3/4×2/3)÷2/3=2
(1/15+2/17)×15×17=47
8(x-2)=2(x+7) x=5

(1)x=17/20-3/5-1/8
=17/20-12/20-1/8
=5/20-1/8
=1/4-1/8
=1/8
(2)x=2/5+4/15+1/10
=12/30+8/30+3/30
=23/30