elise is twice as old as roy. seven years ago , the sum of their ages was 13. How old is roy?

Question

anonymous · Answer

how old is roy now or seven years ago ?

anonymous · Answer

e=2r
(e-7)+(r-7)=13
solve..

anonymous · Answer

now and 7 yrs ago..

anonymous · Answer

ALSO , please help answer this question:

Tom can build a doghouse by himself in 3 days. Jerry can build the same doghouse in 6 days. How will it take them if they work together?

anonymous · Answer

i dont know, really

unklerhaukus · Answer

do they work well together or do the argue?

anonymous · Answer

yes

unklerhaukus · Answer

then it would probably be quicker

anonymous · Answer

how is it?

unklerhaukus · Answer

d=3t
d=6j

why do tom and jerry want to build a dog house , i thought they were a cat and a mouse and they didn't get on well or something, why would they want a dog house?

anonymous · Answer

if both work together it'll take them (3x6)/(3+6)=2 days