6) The senior classes at High School A and High School B planned separate trips to the local amusement park. The senior class at High School A rented and filled 10 vans and 10 buses with 400 students. High School B rented and filled 9 vans and 7 buses with 300 students. Each van and each bus carried the same number of students. Find the number of students in each van and in each bus. F 106 + 10 0 = 400 au + zu = 700 19 v+ 170 = 700 7) New York City is a popular field trip destination. This year the senior class at High School A and the senior class at High School B both planned trips there. The senior class at High School A rented and filled 7 vans and 4 buses with 343 students. High School B rented and filled 6 vans and 7 buses with 494 students. Each van and each bus carried the same number of students. Find the number of students in each van and in each bus. 8) The senior classes at High School A and High School B planned separate trips to New York City. The senior class at High School A rented and filled 5 vans and 3 buses with 192 students. High School B rented and filled 2 vans and 4 buses with 214 students. Every van had the same number of students in it as did the buses. Find the number of students in each van and in each bus. 9) A metal alloy weighing 4 kg and containing 10) A metal alloy weighing 1 oz. and containing 10% platinum is melted and mixed with 6 kg 85% gold is melted and mixed with 3 oz. of a of a different alloy which contains 70% different alloy which contains 5% gold. What platinum. What percent of the resulting alloy percent of the resulting alloy is gold? is platinum? 11) A metal alloy weighing 11 1b. and containing 40% copper is melted and mixed with 1 1b. of pure copper. What percent of the resulting alloy is copper