Question
How many three digit numbers are divisible by
5?Solution
nth = a + (n – 1)d Here, a → first term, n → Total number, d → common difference, n → n term Common difference, (d) = 5 Now, n = a + (n – 1)d ⇒ 995 = 100 + (n – 1) × 5 ⇒ 995 – 100 = (n – 1) × 5 ⇒ 895 = (n – 1) × 5 ⇒ 179 = (n – 1) ⇒ n = 180
If a : b = 4 : 5 and b : c = 6 : 7, find a : c.
If A:B:C = 3:5:7, then find the ratio of (3A + C) : (4B - 0.5C)
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