1. The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?
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By: anil on 05 May 2019 02.05 am
Average of 7 numbers = 30 => Sum of the numbers = $$30 imes7=210$$ Now, sum of first 3 numbers = $$25 imes3=75$$ Similarly, sum of last 3 numbers = $$35 imes3=105$$ => Fourth number = $$210-(75+105)=210-180=30$$ => Ans - (A)
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