posted by mary .
Allen bought 20 stamps at the post office in 37 cents and 20 cents. the total cost of the stamp was $7.06. How many 37cents stamp did Allen Buy
Let x be the number of 37 cent stamps; this means that 20-x will be the number of 20 cent stamps.
0.37 x + (0.20)(20-x)= 7.06 (total dollar value)
0.17 x + 4 = 7.06
0.17 x = 3.06
x = ?