Tolong Kasih tau donk yg no 1-5 yg tugas kelompok

No. 1
a : b = 3 : 5
Nilai a = 42
Nilai b ??

b = 5/3 x 42
   = 70

No. 2
a : b = 5 : 7
karena jumlah maka a + b = 5 + 7 = 12
jumlah a dan b = 48
nilai a
= a/a+b x 48
= 5/12 x 48
= 20

nilai b
= b/a+b x 48
= 7/12 x 48
= 28
Selisih a dan b
= 20 - 28
= -8

No. 3
a : b = 7 : 9
karena selisih maka dikurang, a - b = 9 - 7 = 2
selisih a dan b = 36
nilai a
= a/a-b x 36
= 7/2 x 36
= 126

nilai b
= b/a-b x 36
= 9/2 x 36
= 162
Jumlah a dan b
= 126 + 162
= 288

No. 4
a : b = 5 : 9
Jumlah a + b = 5 + 9 = 14
Jumlah a dan b = 98
nilai a
= a/a+b x 98
= 5/14 x 98
= 35

nilai b
= b/a+b x 98
= 9/14 x 98
= 63
Nilai a = 35 dan nilai b = 63

No. 5
a : b = 4 : 7
selisih a - b = 7 - 4 = 3
selisih a dan b = 24
nilai a
= a/a-b x 24
= 4/3 x 24
= 32

nilai b
= b/a-b x 24
= 7/3 x 24
= 56
Nilai a = 32 dan nilai b = 56.