3) 3/250= 0.012
1.17/33= 1.51(51)
4) 0.3= 3/10
4.18= 4*9/5=5*4/5
(2x+7x):5=27
9х/5=27
9х=27*5=135
х=135/9=15
(8y+y+12y):14=30
21у=30*14
21у=420
у=420/21=20