Andy and bob took a test that had 120 problems. Andy got 30 more problems correct than bob. The number of problems that only andy got correct is six times the number of both boys got correct. There are 20 problem that neither boy got correct. How many problem did both boys get correct?

Abby is collecting rainfall data. she finds that one value of the data set is a high-value outlier. which statement must be true? abby will use a different formula for calculating the standard deviation. the outlier will increase the standard deviation of the data set. the spread of the graph of the data will not change. abby will not use the mean when calculating the standard deviation.