Question

A:B =5:8 jika selisih A:B =21 jumlah A-B adalah....

Answer 1

Selisih dalam ratio: 8-5 = 3
21/3 = 7
A = 5 x 7 = 35
B = 8 x 7 = 56
A - B = 35 - 56 = -21

Semoga Membantu :)

Answer 2

A/B = 5/8
8A = 5B
A = 5B/8

|A - B| = 21
|5B/8 - B| = 21
|5B/8 - 8B/8| = 21
|-3B/8| = 21
3B = 168
B = 56

A = 5B/8
A = 5.56/8
A = 5.7
A = 35

A + B = 35 + 56
= 91

Cara cepat
A+B = 13/3 . 21
= 13.7
= 91