book Maths Puzzle Numerical Ability

A triangle has three angles, R, S, and T. Angle T is 40° greater than angle S. Angle R is 8 times angle S. What is the measure of each angle?

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book Other Question

I need to know how to graph
x+y=4
x+y=9

and i also need to know how many solutions it has.
can you help me please? thanks a lot!
Maria, Kai, and Dom sold tickets to the school dance. Kai sold 11 fewer tickets than 3 times the number Maria sold. Dom sold 10 more than both Maria and Kai put together. Together,