Establishment 17283

The pupils of 7. A planted raspberry and currant bushes in the establishment of the school garden in the same ratio as the number of girls and boys in their class. How many raspberries and a round of currants did they plant when they planted 14 bushes together and in 7? And there are 9 girls and 12 boys?

Correct answer:

m =  6
r =  8

Step-by-step explanation:

m+r = 14
m = 9/12 · r

m+r = 14
12m-9r = 0

Pivot: Row 1 ↔ Row 2
12m-9r = 0
m+r = 14

Row 2 - 1/12 · Row 1 → Row 2
12m-9r = 0
1.75r = 14


r = 14/1.75 = 8
m = 0+9r/12 = 0+9 · 8/12 = 6

m = 6
r = 8

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