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Which is the smallest multiple of 7, which leaves 5 as remainder in each case. when divided by 8, 9, 12 and 15?
365
1085
2525
725
- We're looking for the smallest number \( x \) that when divided by 8, 9, 12, and 15 leaves a remainder of 5.
- First, find the least common multiple (LCM) of 8, 9, 12, and 15.
- The LCM of 8, 9, 12, and 15 is 360.
- We need a number of the form 360k + 5 that is a multiple of 7.
- Solve \( 360k + 5 \equiv 0 \pmod{7} \).
- This gives \( 360 \equiv 3 \pmod{7} \), and \( 5 \equiv 5 \pmod{7} \).
- Solve \( 3k + 5 \equiv 0 \pmod{7} \), which simplifies to \( 3k \equiv -5 \equiv 2 \pmod{7} \).
- The smallest positive integer k that satisfies this is k = 3.
- Calculating \( 360 \times 3 + 5 = 1085 \) verifies this.
Option: 2 - 1085
By: Parvesh Mehta ProfileResourcesReport error
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