1)5x=55
5x:5=55:5
x=11
2)300:y=150
300y=150
150y=300
y=2
3)36000:6=10
4)42:x
42:x=7
42=7x
7x=42
x=6
5)240:10=24
6)283:283+12=1+12=13
7)a:15=1
1/15a=1
a=15
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Answers & Comments
1)5x=55
5x:5=55:5
x=11
2)300:y=150
300y=150
150y=300
y=2
3)36000:6=10
4)42:x
42:x=7
42=7x
7x=42
x=6
5)240:10=24
6)283:283+12=1+12=13
7)a:15=1
1/15a=1
a=15