<human>:  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?
<bot>: How many sheep does Bob have? ** Bob has (300*2) + 35 = <<300*2+35=635>>635 sheep
How many sheep does Mary own? ** For Mary to have 69 sheep fewer than Bob she must own 635 – 69 = 566 sheep
How many sheep must Mary buy? ** As Mary has already 300 sheep she must buy 566 – 300 = <<566-300=266>>266 sheep
#### 266