Heights 8157

The heights of Jirka and David are in the ratio of 5:3. Jirka is 60 cm taller than David. How much does Jirka measure?

Correct answer:

j =  150 cm

Step-by-step explanation:


j= 5/3·d
j= 60+d

5d-3j = 0
d-j = -60

Row 2 - 1/5 · Row 1 → Row 2
5d-3j = 0
-0.4j = -60


j = -60/-0.4 = 150
d = 0+3j/5 = 0+3 · 150/5 = 90

d = 90
j = 150

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