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Step-by-step explanation:
25%×(x+y)=50%×(x-y)
25/100×(x+y)=50/100×(x-y)
25×+25y=50x-50y
25x-50x=-50y-25y
-25x=-75y
x=3y
x/y=3/1
x:y=3:1
4(b)
15%×(p-q)=5%×(p+q)
15p-15q=5p+5q
15p-5p=5q+15q
10p=20q
p=2q
p:q=2:1