Answer:
70%
Explanation:
28+12= 40
28/40= 0.7
0.7x100= 70
Find the total students who attended a school assembly:
28 + 12 = 40
100% = 40 students
1% = 40 ÷ 100 = 0.40
28 ÷ 0.40 = 70
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