Jim is given $10 every day. if he spends $7 every day and save the rest, how much does he save in 3 weeks

63 dollars

because he gets 10 dolars every 21 days by to get 210 dollor. he uses 7*21=147 dollor. his saved money is 210-147=63$

63 dollars

Because if he gets 10 dollars every day there are 7 days in a week so multiply 7x10 to get 70 and if this continues for 3 weeks multiply 70 by 3 to get 210 because he uses 7 dollars every day for three weeks multiply 7 by 21 (for the amount of days in a 3 week period) and you get 147 take 210 and subtract 147 to get 63