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Amir is operating a machine that adds sand to a concrete mixture. The machine adds 110 ton of sand to the mixture in 45 minute. Enter a number in each box to complete the statements. Write the ratio that compares 110 ton of sand to 45 minute. The ratio in ton(s) per minute(s) is $ .

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MrsWilliams18
We can use a proportion box to help us solve this problem. We know that the machine adds 110 tons per 45 minutes. We want to know how many tons can be added per minute. To set up the proportion, we must ensure the units are aligned (as shown in the attached image). Then, we cross multiply and divide. So, the machine can add 2.44 tons of sand per minute. 
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