Issue in getting answer as float in laravel 5.2

I am writing the below code in Laravel 5.1

{!! number_format((float)16 / (float)5, 1) !!}

This gives 3.2 answer

When I write below

{!! number_format((float)(5 + 5 + 3 + 2 + 1) / (float)5, 1) !!}

This gives 3.0

Please suggest how can I get 3.2 in later case ?

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