a) a + 10%a= 55
110%a= 55
a=55: 110%
a= 50
b) a - 15%a = 170
85%a=170
a= 170/85%
a= 200
c) a - 70%a= 360
30%a=360
a=360 : 30%
a= 1200
d) a + 120%a=88
220%a= 88
a=88/220%
a=40
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a) a + 10%a= 55
110%a= 55
a=55: 110%
a= 50
b) a - 15%a = 170
85%a=170
a= 170/85%
a= 200
c) a - 70%a= 360
30%a=360
a=360 : 30%
a= 1200
d) a + 120%a=88
220%a= 88
a=88/220%
a=40