7 . 2000 people attended a basketball match . Let x and y be the number of adults and children attending the match respectively .
( a ) Write down an equation in x and y .
The cost of an adult ticket and a child ticket are $ 50 and $ 15 respectively . The total income of tickets sold for the basketball match was $ 73750 .
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( b ) ( i ) Write down a second equation in x and y .
( ii ) Hence , write down the value of x and the value of y .
( c ) Find the total cost for a tour of 2 adult teachers and 12 children .
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