Average length of eight roadsis12. 5km. If length of seven of them is 12, 16, 22, 8, 13, 5, 10. find the length of eighth road
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12+16+22+8+13+5+10+x ÷8 = 12. 5
96+x =12. 5 ×8
x=4
96+x =12. 5 ×8
x=4
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