Rewrite 4/21 and 2/9 so that they have a common denominator,
2 answers:
Answer:
Step-by-step explanation:
The lowest common multiple between 21 and 9 is 63 as 21 = 21, 42, 63
9 = 9, 18, 27, 36, 45, 54, 63
therefore the common denominator is 63
21 × 3 = 63, so do the same to the numerator.
4 × 3 = 12 the numerator is 12
let's do the same to 2/9
9 × 7 = 63, so do the same to the numerator.
2 × 7 = 14
the numerator is 14
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Answer:
9 labours
Step-by-step explanation:
In order to solve this, we must know which kind of proportionality is this. There are two types of proportions, direct and indirect/inverse proportions. In direct proportion, if one quantity increases, the other quantity also increases.
In indirect proportion, if one quantity increases, the other decreases and vice versa.
As per this question, we know if the number of labour increases, the number of days to complete a work decreases, thus proving that this is an indirect/inverse proportion.
6 labours => 12 days
x labours => 8 days
Since its an inverse proprotion, multiply 6 with 12, and x with 8.
8x = 6 × 12
x =
∴ x = <u>9 labours</u>