Question

The first three terms of a proportion are 15, 20 and 30. Find the fourth term.
b) Construct an angle of 120°​

Answer 1

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Answer 2

Answer:

40

Step-by-step explanation:

15 : 20 :: 30 : x

15 × x = 20 × 30

x = 20 × 30 / 15

x = 20 × 2

x = 40