Check out example codes for "3 inputs in a row". It will help you in understanding the concepts better.

Code Example 1

<style>
    .tight-gutter {
        padding: 0 2px;
    }
</style>

<div class="row">
    <div class="col-sm-4 tight-gutter"><input type="text" class="form-control"></div>
    <div class="col-sm-4 tight-gutter"><select class="form-control"><option value="2">1</option></select></div>
    <div class="col-sm-4 tight-gutter"><input type="text" class="form-control"></div>
</div>

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