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The Smiths are cattle farmers. They currently have 100 mature head of cattle. As a general rule, they expect 9 out of every 10 calves to survive each year. They normally have about 6 calves to every 10 mature head of cattle in a given year. This year they are going to sell half of the calves that survive. The rest they will keep to increase their herd size. How many total head of cattle (including the calves) will be in their herd after they sell half the calves?
Instruction: Write your answer (number ONLY) in the box below.