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Each of the following shapes has a value:

 

 

 

green triangle $= 7$ orange rectangle. $= 17$ red circle. $= \; ?$

The value of the circle changes in each of the following problems.
Can you discover its value in each problem, if the value of the shapes are being added together?

(a) $= 25$
(b) $= 51$
(c) $=136$
(d) $=48$
(e) $=100$