Dad is 4 times as old as his son Jim. In 10 years, Dad's age will be 20 years more than twice Jim's age. How old is Jim?
answer list
10 years old
15 years old
30 years old

Question

anonymous · Answer

15 years old

anonymous · Answer

@sauravshakya Prove it.

anonymous · Answer

how did u get that ya

anonymous · Answer

d=4j ....(i)
4j+10 = 2*(j+10)+20 .....(ii)
solve these equations

anonymous · Answer

@sauravshakya Thank you for posting it. I wrote my equations wrong.

anonymous · Answer

thx

anonymous · Answer

your second equation is wrong
after 10 years jim will be (j+10)years old

radar · Answer

By Jove, I overlooked that.
4j+10= 20+2(j+10)
4j+10=20 +2j+20
2j=30
j=15 now and dad is 60 now    lets see if it checks out for ten years down the road
j will be 25
and dad will 70 and sure enough dad is 20 plus twice junior

radar · Answer

Thanks sauravahakya for pointing that out, sorry johnjohn for the mathematical error (it won't be the last lol)