Its Challenge..Red, Yellow, Blue, Green Heart Puzzle

Its Challenge .. if ..
Red Heart + Yellow Heart = 21
Blue Heart + Green Heart = 195
Yellow Heart + Blue Heart = 105
Green Heart + Red Heart = 39
Yellow Heart + Green Heart = 91
Blue Heart + Red Heart = 45
Then..
Red Heart + Yellow Heart + Blue Heart + Green Heart = ?????

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Its challange..
If...
×=21
×=195
×=105
×=39
×=91
×=45
Then..
+++=?????
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Click here for Answer

3x7=21
15x13=195
7x15=105
13x3=39
7x13=91
15x3=45
so 3+7+15+13=38