8/5:9/6=x:30%0.8:3/4=5/6:x7.2:3.6=x:5.87/9:0.3=7/8:x

Question

8/5:9/6=x:30% 0.8:3/4=5/6:x 7.2:3.6=x:5.8 7/9:0.3=7/8:x

Answer 1

8/5：9/6=x：30℅
8/5：3/2=x：30℅
(3/2)x=(8/5)×30℅
(3/2)x=8/5×3/10
(3/2)x=12/25
x=12/25÷3/2
x=12/25×2/3
x=8/25
0.8：3/4=5/6：x
0.8x=3/4×5/6
0.8x=5/8
(4/5)x=5/8
x=5/8÷4/5
x=5/8×5/4
x=25/32
7.2：3.6=x：5.8
3.6x=7.2×5.8
3.6x=41.76
x=41.76÷3.6
x=11.6
7/9：0.3=7/8：x
(7/9)x=0.3×7/8
(7/9)x=3/10×7/8
(7/9)x=21/80
x=21/80÷7/9
x=21/80×9/7
x=27/80