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1. The variable c is in joint variation with y and z. When the values of y and z are 4 and 6,x is 16.What is the value of x when y = 8 and z = 12?
2.The number of girls varied directly as the number of boys and inversely as the number of teachers. When there were 50 girls, there were 20 teachers and 10 boys. How many boys were there when there were 10 girls and 100 teachers?
3. Strawberries varied jointly as plums and tomatoes. If 500 strawberries went with 4 plums and 25 tomatoes , how many plums would go with 40 strawberries and 2 tomatoes?
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Sagot :
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