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How to change width and height of my logo?

You can use this file:

your-domain.com/templates/less/header-styleXX.less (line 30)
So: 

// Logo
.logo-type-gantry #rt-logo {
    background: url(../images/logo/style1/logo.png) 0 0 no-repeat; width: 231px; height: 52px; display: block; margin-left: -25px; margin-top: 23px; margin-bottom:12px;}