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Complete records: 240 – 60 = <<240-60=180>>180.
Planetary motion records: 2/5 of 180 = (2 × 180) ÷ 5 = 360 ÷ 5 = <<360/5=72>>72.
Total observations: 72 × 32 = <<72*32=2304>>2,304.
A community engagement director coordinates clean-up events in 7 parks. Each park averages 120 volunteers, and 65% collect plastic, 20% collect glass, and the rest collect metal. If each plastic collector removes 1.8 kg, glass collector 1.5 kg, and metal collector 2.3 kg, what is the total waste collected in kg?
Total volunteers: 7 × 120 = <<7*120=840>>840.
Plastic collectors: 65% of 840 = 0.65 × 840 = <<0.65*840=546>>546 → waste: 546 × 1.8 = <<546*1.8=982.8>>982.8 kg.
Glass collectors: 20% of 840 = 0.20 × 840 = <<0.20*840=168>>168 → waste: 168 × 1.5 = <<168*1.5=252>>252 kg.
Metal collectors: remainder = 840 – 546 – 168 = <<840-546-168=126>>126 → waste: 126 × 2.3 = <<126*2.3=289.8>>289.8 kg.
Total waste: 982.8 + 252 + 289.8 = <<982.8+252+289.8=1524.6>>1,524.6 kg.
#### 1524.6