Question

A man bought 42 stamps, some 13¢ and some 18¢. How many of each kind did he buy if the cost was $6.66?

Answer 1

The system of equation which represent the scenario is;

x + y = 42

x + y = 420.13x + 0.18y = 6.66

Simultaneous equation

let

• number of 13 cent stamps = x
• number of 18 cent stamps = y
• Total cost of the stamps = $6.66
• Total number of stamps = 42

x + y = 42

x + y = 420.13x + 0.18y = 6.66

Therefore, the equation which represent the problem is;

x + y = 42

0.13x + 0.18y = 6.66

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