Question

(#-25)÷5+90=100; (200-@)÷10+90=100; 500÷€+(300÷10-20)=60; (30×1-(4×€+50×2)=100

Answer 1

s-25=100-90x5
s-25=50
s=75

200-a=100-90x10
200-a=100
a=200-100=100

500:e+10=60
500:e=60-10
500:e=50
e=10

4f+100=100-1:3
4f+100=33
4f=33-100
4f=-67
f=-16,75