PROMPT ANALYSIS

Let the number of $0.15 stamp be x and number of $0.29 stamp be y. Total value of stamp = 0.15x +0.29y.

Superset

X can be a nonnegative integer

Translation

In order to find the value of x we need:

1# exact value of x and y

2# two equations with x and y as variable to solve for x and y

Statement analysis

St 1: total value of stamp = 4.40 =0.15x +0.29y. One equation two variable. Since we know that x and y are positive integers. We can say 15x +29y =440: x =(440-29y)/15. The only integer that will satisfy will be x = 10 , y = 10, ANSWER. Hence option b, c, e eliminated.

St 2: x =y. Therefore the total will be 0.44x. We cannot calculate the value of x from this information. INSUFFICIENT.

Option A.

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