The ratio "Tons per truck" is= 4.94 in the first case. This ratio is = 5.02 in the second case. It is not the rocket science, not a precise Mechanics, not a Nano-technology and not the atomic Physics. So, with certain confidence we can assume that each truck carries about 5 tons of trash. Then the number under the question can be estimated as = 50.6, or about 51 trucks (rounded up to the nearest whole number).