exam Maths Puzzle Numerical Ability

Evaluate. | -12 | - | -10|

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exam Other Question

Seventy children and 160 adults attended a movie theatre. The total reciepts were $620. One adult ticket and two children tickets cost 7$ Find the price of each type of ticket.

Thanks for your help! how do you do this equation it seems impossible to me... 9(a+4)=7a