document.write( "Question 1002578: Question: Jake is 13 years old. In 3 years his grandpa will be twice as old as Jake's dad, and in 7 years his grandpa will be four times older than Jake. How old is Jake's dad?
\n" ); document.write( "I've tried 13*4=52. 52-7=45. 45+3=48. 48/2=24.
\n" ); document.write( "I'm not sure what steps I'm missing or what math I'm doing wrong \n" ); document.write( "

Algebra.Com's Answer #853938 by ikleyn(53742) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "Jake is 13 years old. In 3 years his grandpa will be twice as old as Jake's dad,
\n" ); document.write( "and in 7 years his grandpa will be four times older than Jake. How old is Jake's dad?
\n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "        As printed in the post, this problem is a lame horse with three legs.\r
\n" ); document.write( "\n" ); document.write( "        Why ? - Because no one professional English writer will write \"will be four times older than Jake\".\r
\n" ); document.write( "\n" ); document.write( "        Why ? - Because it is not accepted in English to formulate Math problems using this form.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "        So, I will interpret the whole problem in THIS way\r
\n" ); document.write( "\n" ); document.write( "

 \r\n" );
document.write( "          Jake is 13 years old. In 3 years his grandpa will be twice as old as Jake's dad, \r\n" );
document.write( "          and in 7 years his grandpa will be four times as old as Jake. How old is Jake's dad?\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( " In this form, the problem is a nice arithmetic problem to solve it MENTALLY by reasoning.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "Jack is 13 years old now.\r\n" );
document.write( "\r\n" );
document.write( "In 7 years, Jack will be 13+7 = 20 years old.\r\n" );
document.write( "\r\n" );
document.write( "Hence, in 7 years, Jack's grandpa will be 20*4 = 80 years old.\r\n" );
document.write( "\r\n" );
document.write( "It means that Jack's grandpa is 80-7 = 73 years old now.\r\n" );
document.write( "\r\n" );
document.write( "In 3 years, the grandpa will be 73+3 = 76 years old.\r\n" );
document.write( "\r\n" );
document.write( "Hence, in 3 years, Jack's father will be 76/2 = 38 years old.\r\n" );
document.write( "\r\n" );
document.write( "It means that Jack's father is 38-3 = 35 years old now.    ANSWER\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved in this interpretation.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "This problem is a good exercise, since it teaches a student to build a logical chain of steps.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );