Answer:
25kg is the largest mass.
Explanation:
Convert all the masses to kg so that the units would be uniform
1mg = 10^-6kg
2.5×10^-2mg = 2.5×10^-2×10^-6 = 2.5×10^-8kg
1pg = 10^-15kg
2.5×10^15pg = 2.5×10^15×10^-15 = 2.5kg
1ng = 10^-12kg
2.5×10^10ng = 2.5×10^10×10^-12 = 0.025kg
1fg = 10^-18kg
2.5×10^9fg = 2.5×10^9×10^-18 = 2.5×10^-9kg
