Purchased 82340

The company secretary bought stamps worth CZK 20 and CZK 15. The total number of purchased stamps is 120, and the secretary paid a total of 2265 CZK. How many stamps worth 15 CZK did she buy?

Correct answer:

b =  27

Step-by-step explanation:

a+b=120 20a+15b=2265  20(120b)+15b=2265  20 (120b)+15 b=2265  5b=135  b=5135=27  b=27   Verifying Solution:  a=120b=12027=93



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