Mathematics
Grade9
Easy
Question
Find the value of x.
- 5
- 20
- 10
- 15
Hint:
For every proportion, the product of the extremes is always equal to the product of the means, i.e., a : b : : c : d if and only if ad = bc.
For example; in proportion 3 : 4 : : 9 : 12;
Product of extremes = 3 × 12 = 36 and product of means = 4 × 9 = 36
The correct answer is: 5
For every proportion, the product of the extremes is always equal to the product of the means, i.e., a : b : : c : d if and only if ad = bc.
Product of extremes = product of means
1 
10 = 2 x
2x = 10
x = 5
Thus, the value of x is 5.
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