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ICSE-VIII-Mathematics

05: Playing with Number Class 8 Maths

with Solutions - page 4
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  • #5
    3 × 26 a multiple of 6?
    Ans : × 26 is a multiple of 6
    3 + x + 2 + 6 is a multiple of 3
    ⇒ 11 + x = 0, 3, 6, 9, 12, 15, 18, 21
    ⇒ x = -11, -8, -5, -2, 1, 4, 7, 10, ......
    Since, x is a digit
    x = 1, 4 or 7