Mary has 300 sheep and Bob has double the number of sheep as Mary plus another 35. How many sheep must Mary buy to have 69 fewer sheep than Bob?
Bob has (300*2) + 35 = <<300*2+35=635>>635 sheep
For Mary to have 69 sheep fewer than Bob she must own 635 – 69 = 566 sheep
As Mary has already 300 sheep she must buy 566 – 300 = <<566-300=266>>266 sheep
#### 266