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Let the three numbers be A,B and C respectively
A : B = 2 : 3 (1)
B : C = 5 : 8 (2)
Multiplying (1) by 5 and (2) by 3,
A : B = 10 : 15
B : C = 15 : 24
A : B : C = 10 : 15 : 24
Sum of ratio = 10+15+24=49
B = \frac{<span class="katex"><span class="katex-html" aria-hidden="true"><span class="base"><span class="mord"><span class="mfrac"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist">15</span><span class="vlist-s">}{49}</span></span></span></span></span><span class="mbin"> \times </span></span><span class="base"><span class="mord">9</span><span class="mord">0 = 27.55 ≈ 30
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