Question

Type-II
1. The sum of the age of a father and his son is 100 years
now. 5 years ago ratio of their age was 2 : 1 then what
will be the ratio of their age after 10 year.
यदि पिता और पुत्र की आयु का योग 100 वर्ष है। पाँच साल पहले
उनकी आयु का अनुपात 2 : 1 था। तो 10 साल बाद उनकी आयु
का अनुपात क्या होगा ?
(a)5:2
(b)4:3
(c) 10:7
(d)5:3​

Answer 1

5 years back the sum of their ages was 100-(5+5)=100-10=90

The ratio of their ages was 2:1(Given)

Therefore,let's assume the father's and son's ages as $2x$ and $x$ respectively.

$2x+x=90\\=3x=90\\= x=\frac{90}3} \\=x=30$

Father's age 5 years ago=$2x=$2×30

                                                =60

Son's age 5 years ago=$1x$=1×30

                                           =30

∴Father's age after 10 years =60+5+10 (Because the age we calculated was                                               5 years ago)

                                                =75

∴Son's age after 10 years =30+5+10

                                           =45

∴Ratio=75:45

            5:3

ANSWER:(D)5:3

HOPE IT HELPS YOU!

PLS MARK AS BRAINLIEST!