How many moles of ammonia are in 1.20 x10 25 molecules of ammonia?

The moles of ammonia in 1.20 x10^25 molecules of ammonia is calculated as follows

by use of Avogadro constant

1moles = 6.02 x10^23

what about 1.20 x10^25 moles

by use of cross multiplication

= 1 mole x (1.20 x10^25) / (6.02 x10^23) = 19.93 moles