Answer :
So april has 30 days and we know that 3/5 of those days were sunny. Then the number of sunny days in april was:
[tex]\frac{3}{5}\cdot30=18[/tex]So there wer 18 sunny days in april. This means that the rainy days are given by:
[tex]30-18=12[/tex]Then the answer is 12 days.