Kids grow up fast these days!

Algebra Level 1

Lily is twelve years old and her brother, Percy, is eight. How old will Lily be when the sum of their ages is forty?


The answer is 22.

Thomas Crow by Thomas Crow , 24, United Kingdom

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5 solutions

Thomas Yems
Jun 1, 2014

Let Lily's age be x, then Percy's age is x-4.

Hence:

Lily's age + Percy's age = 40

x + x - 4 = 40

2x - 4 = 40

2x = 44

x = 22

3 Helpful 0 Interesting 0 Brilliant 0 Confused

so cool =))

Trường Chinh Đoàn - 6 years, 10 months ago

I spelt it 'Lily' but other than that top marks Yemsy! It's like the good old days ;)

Thomas Crow - 7 years ago

I'm not good at this that I solve it this way, 40-4= 36, (since their gap is 4) 36/2= 18. (since they are only 2) so, their ages are 18+4 and 18. thus, lily is 22 since she is older than her brother. I'm too poor :) but it's a nice try for me.

Emy Quijano - 6 years, 10 months ago
Fox To-ong
Jan 31, 2015

12 + x + 8 + x = 40 x = 10 12 + 10 = 22 age of liliy

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Suyeon Ju
Aug 7, 2014

12+8=20, 20/2=10, 12+10=22, 8+10=18, 22+18=40, lily is 22

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Let the age of Lily be x

So, age of Percy=x-4

or,

x+x-4=40

2x=44

x=22

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Hassan Raza
Jul 31, 2014

L i l y i s t w e l v e y e a r s o l d a n d h e r b r o t h e r , P e r c y , i s e i g h t m e a n L i l y i s 4 y e a r e l d e r t h a n h e r b r o t h e r w h e n t h e s u m o f t h i e r a g e s i s 40 L i l y i s 22 y e a r o l d a n d h e r b r o t h e r i s 18. 22 + 18 = 40 Lily\quad is\quad twelve\quad years\quad old\quad and \quad her \quad brother, Percy, is \quad eight\\ mean\quad Lily\quad is\quad 4\quad year\quad elder\quad than\quad her\quad brother\\ when\quad the\quad sum\quad of\quad thier\quad ages\quad is\quad 40\\ Lily\quad is\quad 22\quad year\quad old\quad and\quad her\quad brother\quad is\quad 18.\\ 22+18=40

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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