Depends on the math book.
depends what kind
400g
A school backpack should weigh less then 15 % of your body weight.
1
678tons
How much do math middle school teacher make you a year ? Honestly I can not answer this particlar question I really dont know
it ways about 1 kilogram
Roughly 8.5 lbs per gallon. You do the Math.
The weight of a phone book can vary depending on factors such as size, number of pages, and paper quality. On average, a phone book might weigh around 1-2 pounds.
just do the math 700 - 227 use a calculator
Mac book air weight is 2.3pound (1.06kg)