Current location - Training Enrollment Network - Mathematics courses - Buy 5 strings for math problems and get 2 strings for free. 30 yuan buys 5 strings, and Aunt Wang 1 time. How much cheaper is each bundle? Tell it to the fourth grade, thank you!
Buy 5 strings for math problems and get 2 strings for free. 30 yuan buys 5 strings, and Aunt Wang 1 time. How much cheaper is each bundle? Tell it to the fourth grade, thank you!
30-[(30 * 5) ÷ (2+5)] = 8.57 yuan
The process is as follows:
Aunt Wang/kloc-0 bought 5 strings each time, gave 2 strings for free, and * * * gave 7 strings. Fee: 30 * 5 = 150 (RMB).
The average price of each bundle is: 150 ÷ 7 = 2 1.43 yuan.