Question

A:B =7:2.jika A+B=81,maka B=...



Tolong kasih tau caranya

Answer 1

Diketahui:
A:B = 7:2 -->>A/B = 7/2
A+B = 81 -->> A = 81 - B

Jwab:
A/B = 7/2
2A = 7B
2(81-B) = 7B
162 - 2B = 7B
162 = 7B + 2B
162 = 9B
B = 162/9
B = 18