Answer:
Stickers given by Harry = 50
Step-by-step explanation:
Given that:
Number of stickers = 300
Ratio of Harry's stickers to Gary's stickers = 7:3
Let,
x be the number of times.
7x+3x= 300
10x = 300
Dividing both sides by 10
![\frac{10x}{10}=\frac{300}{10}\\x=30](https://tex.z-dn.net/?f=%5Cfrac%7B10x%7D%7B10%7D%3D%5Cfrac%7B300%7D%7B10%7D%5C%5Cx%3D30)
Harry's stickers = 7(30) = 210
Gary's stickers = 3(30) = 90
New ratio of Harry's stickers to Gary's stickers = 8 : 7
8x + 7x = 300
15x = 300
Dividing both sides by 15
![\frac{15x}{15}=\frac{300}{15}\\x=20](https://tex.z-dn.net/?f=%5Cfrac%7B15x%7D%7B15%7D%3D%5Cfrac%7B300%7D%7B15%7D%5C%5Cx%3D20)
Harry's new number of stickers = 8(20) = 160
Gary's new number of stickers = 7(20) = 140
Stickers given by Harry = 210 - 160 = 50
Hence,
Stickers given by Harry = 50