jacob is 12 years old . he is 4 times as old as his brother . how old will jacob be when he is twice as old ?
"j = 12 ; j = 4 b ; b = 12 / 4 = 3 ; twice as old so b = 3 ( now ) + ( 3 ) = 6 ; jacob is 12 + 6 = 18 answer : e"
multiply(12, 4)