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Question

Simplify:
3+115+23-715

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Solution

We have:
3 + 115 + 23 -715 = 31 + 65 + 23 - 715 5 5, 3, 15 3 1, 3, 3 1, 1, 1 L.C.M. of 1, 5, 3 and 15 = (5 × 3 ) =15 = 45 + 18 + 10 - 715 15 ÷ 1 =15, 15 × 3 = 45, 15 ÷ 5 =3, 3 × 6 = 18, 15 ÷ 3 = 5, 5 × 2 = 10 and 15 ÷ 15 = 1, 1 × 7 = 7 = 73 - 715 = 6622155 =225 = 425

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