The probability for getting a red apple is 70% and green apples is 30%.
So for getting three different apples is impossible since there are two types of apples.
The cost for six pencils would be a total of 150p
The reason why is if three pencils cost 75p and you want to know what the cost of six, since three is half of six you would do this (if 3=75p then 3*2=75p*2 which is 6=150p). As shown, you multiply each side by 2 or double each side