The average (arithmetic mean) height of five of Peter's friends is 70 inches. What will be the new average height if...

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The average (arithmetic mean) height of five Peter's friends is 70 inches. What will be the new average height if Peter is included in the group?

1) Peter's height is 1 foot greater than the average height of his five friends (1 foot = 12 inches)
2) Peter is 5 inches taller than the tallest of his five friends

The OA is A
Source: — Data Sufficiency |