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PSLE Average Question : Tao Nan SA 2 paper 1 question 2

This Challenging PSLE Average question appeared in Tao Nan.

Tao Nan SA 2 paper 1 question 2

The average of seven numbers is 49. If is added to the first number, 2 is added to the second number, 3 is added to the third number and so on up to the seventh number, what is the new average?

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