Question

Big dig diamond company pulverizes 152 tons of rock for every 2 ounces of diamonds it finds. how many tons of rock must it grind up in order to locate 20 ounces of diamonds?

Answer 1

For this case what we can do is the following rule of three:
 152 -----> 2
 x --------> 20
 We clear the value of x:
 x = (20/2) * (152)
 x = 1520 tons
 Answer: 
 in order to locate 20 ounces of diamonds the company needs: 
 x = 1520 tons of rock