decenas de

adj.

tens of.

* * *

= tens of, scores of

Ex. There are now a number of degrees of integration: 'SSI' Small Scale Integration (tens of transistors on a single chip); 'MSI' Medium Scale Integration (hundreds of transistors); 'LSI' Large Scale Integration (thousands of transistors); and 'VSLI' (hundreds of thousands of transistors).

Ex. Popular authors receive scores, in some cases hundreds, of letters a year from their young readers and every correspondent, I am quite sure, wants a reply.

* * *

= tens of, scores of

Ex: There are now a number of degrees of integration: 'SSI' Small Scale Integration (tens of transistors on a single chip); 'MSI' Medium Scale Integration (hundreds of transistors); 'LSI' Large Scale Integration (thousands of transistors); and 'VSLI' (hundreds of thousands of transistors).

Ex: Popular authors receive scores, in some cases hundreds, of letters a year from their young readers and every correspondent, I am quite sure, wants a reply.