Question

Пжжж помогите, даю 100B пожалуйста ​

Answer 1

$390 + 4900 \div k = 460 \\ 4900 \div k = 460 - 390 \\ 4900 \div k = 70 \\ k = 4900 \div 70 \\ k = 70$

$230 \times a + 40 = 10000 \div 20 \\ 230a + 40 = 500 \\ 230a = 500 - 40 \\ 230a = 460 \\ a = 460 \div 230 \\ a = 2$

Answer 2

390 + 4900 ÷ k = 460
4900 ÷ * = 460 - 390
4900 ÷ k = 70
k = 4900 ÷ 70
‡ = 70
230 x a + 40 = 10000 ÷ 20
230a + 40 = 500
2300 = 500 - 40
2300 = 460
a = 460 ÷ 230
a = 2