book Maths Puzzle Numerical Ability

Can you help me add the following problem in the lowest terms:

13/18 + 11/18

Thanks!

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book Other Question

problem given by teacher from a worksheet
3 circles on the same straight line, the 1st with a radius of 16 cm, the 2nd with a radius of 9cm, is there a way to find the radius of the 3rd circle which sits in between the other two?
thank you bx+a=dx+c