Question

Dacă:

x=
$\frac{x}{21} = \frac{10}{y} = \frac{5}{7}$
,atunci x+y =? ​

Answer 1

7x=5*21
70=5y

x=15
y=14 deci x+y=29

Answer 2

7x = 105
x = 15
15/21 = 10/y
15y = 210
y = 14

x + y = 29