Aspire Faculty ID #11106 · Topic: DU MCA 2021 · Just now
DU MCA 2021

Age of a child is half of the age of father. Twenty years ago the age of father was 10 times the age of son. What is the age of father?
(a) 60 years
(b) 55 years
(c) 50 years
(d) 45 years

Solution

Let father's age be $F$ and child's age be $C$.

Given $C = \dfrac{F}{2}$

Twenty years ago: $F - 20 = 10(C - 20)$

Substitute $C = \dfrac{F}{2}$:

$F - 20 = 10\left(\dfrac{F}{2} - 20\right)$

$F - 20 = 5F - 200$

$180 = 4F \Rightarrow F = 45$

Answer: $\boxed{45\text{ years}}$ ✅ (Option d)

← Previous Next →

Previous 10 Questions — DU MCA 2021

Nearest first
1
Next term in the series zaa, yeb, xic, wod, vue, ...is(a) uaf(b) uef(c) teg(d) tag
Topic: DU MCA 2021
 2
What is the next term in the series 6, 20, 42, 72, 110, ... is(a) 156(b) 210(c) 110(d) 119
Topic: DU MCA 2021
 3
Given that $3^x$=656. The value of $5^{x-5}$ is ...(a) 81(b) 125(c) 225(d) 1/125
Topic: DU MCA 2021
 4
Which one of the following statements is NOT correct in the ring $ R = \mathbb{Z}_4 \oplus \mathbb{Z}_6? $ 
Topic: DU MCA 2021
 5
Let $Re(z)$ and $Im(z)$ be the real and imaginary parts of any complex number $z$, and $\arg(z)$ denotes the principal …
Topic: DU MCA 2021
 6
Question
Topic: DU MCA 2021
 7
Question
Topic: DU MCA 2021
 8
Question
Topic: DU MCA 2021
 9
Question
Topic: DU MCA 2021
 10
Question
Topic: DU MCA 2021

Next 10 Questions — DU MCA 2021

Ascending by ID
1
In a race of 1 Kilometer, athlete A beats athlete B by 50 meters, in another race of 500 meters, athlete B beats athlet…
Topic: DU MCA 2021
 2
Persons A, B, and C can finish a work in 15, 10, and 12 days respectively. Person B and person C start the work togethe…
Topic: DU MCA 2021
Ask Your Question or Put Your Review.

loading...