Raj scored 67, 69, 78, and 88 in 4 of his subjects. What should be his score in the 5th subject so that his average equals 80?
Let he score x in 5th subjects
Average = $$\frac{\left(67+69+78+88+x\right)}{5}$$
80 = $$\frac{302+x}{5}$$
400 = 302 + x
x = 98
Hence he has to score 98 in 5th subject
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