Question

Problema 4, multumesc!

Answer 1

$\frac{10}{100} \times a = \frac{1}{10} \times a = \frac{a}{10}$

$\frac{20}{100} \times a = \frac{1}{5} \times a = \frac{a}{5}$

$m_{a} = 26$

$\frac{a + \frac{ a }{10} + \frac{a}{5} }{3} = 26 \: | \times 3$

$a + \frac{a}{10} + \frac{a}{5} = 78 \: | \times 10$

$10a + a + 2a = 780$

$13a = 780 \: | \div 13$

$a = 60$

Answer 2

(a+0,1a+0,2a):3=26

1,3a=26*3

a=26*3:1,3=26:1,3 *3

a=260:13*3

a=20*3

a=60

as simple as that!!