Tom’s weight is 20 pounds less than twice carl’s weight. if together tom and carl weigh 340 pounds, how much does tom weigh?

T = Tom's weight
c = Carl's weight

we know that twice of Carl's weight equals Tom's weight + 20 pounds so
2c = t+20
and we know that Tom's weight + Carl's weight = 340
t+c = 340

then from there you can solve using substitution or elimination

It’s 24.6 after you round to the nearest tenths the answer should be 25.0