Question

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Answer 1

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To find the least number, we need to find the LCM of 36, 48, 21 and 28.

$⇒36=2×2×3×3$

$⇒48=2×2×2×2×3×3$

$⇒21=3×7$

$28=2×2×7$

$\text{Thus the LCM of these numbers is } {2}^{4} \times {3}^{2} \times 7 = 1008$

• The LCM of 36, 48, 21 and 28 is 1008.

When 5 is added to 1008, we get 1013.

Hence, 1013 is the least number when decreased by 5 is divisible by 36, 48, 21 and 28.

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Answer 2

hopefully its helped u :)