Question

[20+a)÷2-15]:5×3=15 va rog,ajutor​

Answer 1

$( \frac{20 + a}{2} - 15) \times \frac{1}{5} \times 3 = 15$

$\frac{20 + a - 30}{2} \times \frac{1}{5} \times 3 = 15$

$\frac{ - 10 + a}{2} \times \frac{1}{5} \times 3 = 15$

$\frac{3 ( - 10 + a)}{10} = 15$

$\frac{ - 30 + 3a}{10} = 15$

$- 30 + 3a = 150$

$3a = 150 + 30$

$3a = 180$

$a = 60$