1. ben said: for every $60 the sixth graders plan to raise, the seventh graders plan to raise $90. he looks at the principal's thermometers and sees that $60 is at the same place on the sixth-grade thermometer as $90 is on the seventh-grade thermometer.
ben also makes the claim: for every $30 the sixth graders plan to raise, the seventh graders plan to raise $45.
do you agree with this claim? explain your reasoning.