If + =150 and + = 120, then what number does stand for?

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If<br><img src='https://www.fatskills.com/images3/class3olympiad/image01377.jpeg' width='100px' ><br> +<br><img src='https://www.fatskills.com/images3/class3olympiad/image01377.jpeg' width='100px' ><br>   =150 and<br><img src='https://www.fatskills.com/images3/class3olympiad/image01377.jpeg' width='100px' ><br> +<br><img src='https://www.fatskills.com/images3/class3olympiad/image01378.jpeg' width='400px'>   = 120, then what number does<br><img src='https://www.fatskills.com/images3/class3olympiad/image01378.jpeg' width='100px'>   stand for?