3. In a particular type of steel, the ratio of iron and carbon is 49: 1. Let's calculat to find, in 250 quintal of such steel how much iron is there.
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At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.