P4/P5 Math: Sum of 2 not given

The following question type is an advance version of "Sum of 2 given".

Instead of giving a sum of 2 (out of 3 items) , the sentences are rephrased in another manner.

Such questions usually appears in Paper 1.
Calculator usage is not allowed.

The students of class 5A, each joined one of these 3 different clubs,
namely, a computer club, a nature club and an astronomy club.

15 students are not members of the computer club.
17 students are not members of the nature club.
12 students are not members of the astronomy club.

How many students are there in class 5A?

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P4 Math: Sum of 2 given

The question type below uses the sum of 2 to describe the relationship between 3 objects.

Such questions often appear in P4 exam papers in Section C.

A more complex version of this question can also be found here.

Abigail, Beth and Candice were given a sum of money to share. The total of Abigail and Beth's share is $35. The total of Beth and Candice's share is $26. The total of Abigail and Candice's share is $31

How much did the 3 girls have altogether?

If the above question is easy, try to do the more challenging question below.

The question below will randomize with different numbers every hour. 

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