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Berlaku kesebandingan:
Untuk nilai a.
4/(4+6) = 5/(5+a)
4/10 = 5/(a+5)
2/5 = 5/(a+5)
2(a+5) = 25
2a + 10 = 25
2a = 25 - 10
2a = 15
a = 7,5
Untuk nilai b.
4/b = (4+6)/[11 ¼]
4/b = 10/(45/4)
4/b = 40/45
4/b = 8/9
9.4 = 8.b
8b = 36
b = 36/8
b = 4,5
Bagian b.
Berlaku:
12/(12+3) = 16/(16+a)
Sehigga:
12/15 = 16/(16+a)
4/5 = 16/(16+a)
4(16+a) = 16.5
64 + 4a = 80
4a = 80 - 64
4a = 16
a = 4
Bagian c.
Note : Mungkin cukup sulit untuk dipahami.
Untuk nilai a.
2/a = a/8
a.a = 8.2
a² = 16
a = √16
a = 4
Untuk nilai b.
2/b = b/(2+8)
2/b = b/10
b.b = 10.2
b² = 20
b = √20
b = 2√5
Untuk nilai c.
2√5/c = 2/a
[2√5]/c = 2/4
[2√5]/c = 1/2
c = 2.2√5
c = 4√5
Bagian d.
Untuk nilai a.
10/a = (10+10)/(7+7)
10/a = 20/14
10/a = 10/7
Perlu, a = 7
Untuk nilai b.
7/b = (7+7)/(10+10)
7/b = 14/20
7/b = 7/10
Perlu, b = 10
Untuk nilai c,
7/c = (7+7)/18
7/c = 14/18
7/c = 7/9
Perlu, c = 9