SSC IB Security Assistant & MTS Mock Test Series 2023 Quantitative Aptitude Average

The average of the numbers a, b, c and d is 2d + 4. Also, the averages of the numbers a and b; b and c; c and d are 8, 5 and 4, respectively. If e = a + d - 1, then what is the average of the numbers d and e ?

1
8.5
2
7
3
8
4
3
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