Saving

Paul saves 155Kč in 46 2 Kc and 5Kc coins. How much saved 2Kc and 5Kc coins?

Correct answer:

a =  25
b =  21

Step-by-step explanation:


155 = 2a +5b
a+b = 46

155 = 2·a +5·b
a+b = 46

2a+5b = 155
a+b = 46

Row 2 - 1/2 · Row 1 → Row 2
2a+5b = 155
-1.5b = -31.5


b = -31.5/-1.5 = 21
a = 155-5b/2 = 155-5 · 21/2 = 25

a = 25
b = 21

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