Question

The HCF and LCM of two numbers are 9 and 90 respectively. If one number is 18, then
the other number is (1)
a. 54
b. 36
c 45
d. 63​

Answer 1

product of HCF and LCM is equal to product of two numbers

By this relation

9×90=18× unknown value

There for the unknown value is equal to 45

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Answer 2

Answer:

Other number is 45

Step-by-step explanation:

LCM and HCF of two numbers $x$ and $y$ are related as follows:

$LCM \times HCF = x \times y$

Here, we have

LCM = 90

HCF = 9

x = 18

Substituting the values, we get

$90 \times 9 = 18 \times y\\\\810 = 18y\\\\y = \frac{810}{18}\\\\y = 45$

Thus, other number is 45