Question 1138776
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Given the ratio of 5:2, let the two numbers of stickers be 5x and 2x.  It is a common way to start any problem involving ratios.<br>
The difference between the two amounts is 5x-2x = 3x; and we know that difference is 15.<br>
3x=15 means x=5.<br>
So the numbers of stickers the two of them have are 5x=25 and 2x=10; the total number of stickers is 25+10 = 35.<br>
Or you could simply say the total number of stickers is 5x+2x = 7x = 35.