Age Riddle

Algebra Level 1

A woman composed the following riddle about her age:

Four times two and nine times three

Add that to my age and it will be

As much as two tens and a four

Plus twice my age exceeds a score.

Put into algebra, it simply means 4 2 + 9 3 + x = 2 10 + 4 + 2 x 20. 4\cdot 2+9\cdot 3+x=2\cdot 10+4+2\cdot x-20. How old is the woman?


The answer is 31.

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10 solutions

Joshua Ong
Aug 28, 2014

4 × 2 + 9 × 3 + x = 2 × 10 + 4 + 2 x 20 4\times2+9\times3+x=2\times10+4+2x-20 8 + 27 + x = 20 + 4 + 2 x 20 8+27+x=20+4+2x-20 35 + x = 4 + 2 x 35+x=4+2x x + 31 = 2 x x+31=2x x = 31 x=\boxed{31}

Good Buddy..

John Aries Sarza - 6 years, 9 months ago

i have one doubt how was -20 came in right hand side

James Man - 6 years, 8 months ago

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It is said in the riddle that 2 10 + 4 + 2x (being x the age) exceeds 4 3 + 9*3 + x by a "score", which is an english word that can be used to say 20.

Anonymous Person - 6 years, 8 months ago

How tough ! :P

Aditya Raut - 6 years, 9 months ago

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Well the equation WAS given in the question...

Joshua Ong - 6 years, 8 months ago

I got 39 on my first try... just success on second try T_T

Nurul Azwa Nor'asicken - 6 years, 9 months ago

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you're so cute......

Agustin Peñalosa Jr. - 6 years, 9 months ago

The score part was rally confusing...

Suman Dhara - 6 years, 8 months ago

Start by subtracting X from both sides, then notice that (2 x 10) - 20 = 0. You can do the rest in your head...

4 × 2 + 9 × 3 = 4 + X

8 + 27 = 4 + X

X = 31

Peter D Morrison - 3 years, 5 months ago

That was what I got too

Anthony Teo - 6 years, 9 months ago
Fer Wiclies
Sep 2, 2014

The true riddle is what a "score" means 😁

By dictionary definition, a score means a group of 20.

ZhiJie Goh - 6 years, 9 months ago

It means 20.

ZhiJie Goh - 6 years, 9 months ago

but how the score is twenty?

Pranjal Singh - 6 years, 9 months ago

as in Four score and seven years ago...

james brady - 6 years, 9 months ago

Indeed it is... removing the equation wouldn't complicate everything a lot, just cause trouble to people who didn't know "score" also ment 20 before.

Anonymous Person - 6 years, 8 months ago
Mark Hoben Aquino
Sep 24, 2014

(4 X 2) + (9 X 3) + x = (2 X 10) + 4 + 2x - 20

8 + 27 + x = 20 + 4 + 2x - 20 ( combine like terms)

35 + x = 24 + 2x - 20 (transpose)

x - 2x = 24 - 35 - 20 (perform the operation)

-x = 24 - 55 ( subtract)

-x = -31

x = 31

Amber McKnight
Mar 6, 2016

(4•2)+(9•3)+x=(2•10)+4(2•x)-20. (Starting Equation) (8+27)+x=24+2x-20. (Distribute on both sides; add the 4 to 20) 35+x=4+2x. (Subtract the 20 from 24; add 8 and 27) 35=4+x. (Subtract x from the left side) 31=x. (Subtract 4 from the right side)

Mikaela Lahn
Mar 5, 2016

(4 * 2) + (9 * 3) + x = (2 * 10) + 4 + (2 * x) - 20

8 + 27 + x = 20 + 4 + 2x - 20

35 + x = 4 + 2x

35 - 4 = 2x - x

31 = x

Vishal S
Dec 14, 2014

4 X 2+9 X 3+x=2 X 10+4+2x-20 =>35+x=4+2x =>x=31 therefore the age of the woman is 31 years

Junior Escalona
Nov 17, 2014

8+27+x=24-20

Aporajita Tume
Oct 14, 2014

how does -20 come ?? and it would b better if the equation was not given

James Man
Sep 18, 2014

i have a doubt how -20 came in the right hand side

Because the riddle states "exceeds a score", so you have do deduct 20 (a score) for the Right hand side.

ZhiJie Goh - 6 years, 8 months ago
Jake Owen
Sep 4, 2014

4x2 + 9x3 + X= 2x10 + 4+2X-20 -X -X 8+27= 20+4-X-20 +20 +20 55=24+x -24 -24 31=x

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