30% of 40 kggive full explanation = 1200
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30 + 40 + 10 + 40 = 120120/4 = 30Average = 30
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
40 (30 must be 3/4 of orig number so (30/3)*4) pls give explanation?
0.7530/40:= 30 ÷ 40= 0.75 in decimal
40 - 30 = 10 if question is percent then 40 = 100% 4 = 10% 12 = 30% 40 - 12 = 28