P6 Math: 3 Parties but only sum of 2 given

The question below usually appear in many schools' Prelim Papers just before the PSLE.

Such questions will appear in Paper 2.  
Calculator usage is allowed.

This question revisits a similar P4 concept here.

Harry and Randall and Patrick made some paper flowers for a charity event.
The number of paper flowers made by Harry and Randall was 290.
The number of paper flowers made by Randall and Patrick was 728.
Patrick made thrice as many paper flowers as Harry.

How many paper flowers did the 3 boys make altogether?


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