@foreach($questions->slice(0)->take(5) as $k1 => $question1)
@endforeach
@foreach($questions->slice(5)->take(5) as $k2 => $question2)
@endforeach
@foreach($questions->slice(10)->take(5) as $k3 => $question3)
@endforeach
@foreach($questions->slice(15)->take(5) as $k4 => $question4)
@endforeach