16: Q 1: It takes 5*0.25= 1.25 kg of flour to make a 5 kg cake. The baking powder needs 5*2.5= 12.5 kg. Q 2: To make a 5.5-ton cake, eggs and sugar are 1 ton = 1000 kg, and 5.5 tons = 5,500 kg respectively.

5500*0.4=2200 Jin of eggs, 5500*0.25= 1375 Jin of sugar.

17: adult round trip 12.4*2=24.8 yuan, one person, one vote, two people, 2*24.8=49.6 yuan, and children in xiaolan are half price 12.4 yuan. ***49.6+ 12.4=62 yuan. Found 100-62=38 yuan.

18: average uphill climb is 7.2/3 = 2.4km/h. Downhill 7.2/2= 3.6 kilometers per hour.

20: 1522/0.36 is about 4228 meters. 2 1:A = 26.4÷( 10+ 1)= 2.4； B=2.4* 10=24

22: 1:(0.5),(50),(0. 105)2:( 17.54),(840),(47.8 1)/(7)

23:13.72+14.02 = 27.74m. 1 10-27.74=82.26 meters. 82.26/ 10=8.226 meters.

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24: 1:2.05 2:0.025