Question 789107
Let


x = # of minor disasters 
y = # of major disasters 


5/2 = x/y


5y = 2x


2x = 5y


x = 5y/2


-------------------------------------------------------


x+y = 980


5y/2 + y = 980


2*(5y/2 + y) = 2*980


5y + 2y = 1960


7y = 1960


y = 1960/7


y = 280


x = 5y/2


x = 5*280/2


x = 700


So there were <font color="red">700</font> minor disasters.