Question

Таня и ее подруга должны надписать 300 поздравительных открыток . Таня надписывает 30 открыток в час,а ее подруга - 35 открыток . Сколько открыток останется им надписать через 2 часа совмесной работы? через 4 часа?

Answer 1

30*2=60 (откр.) - Таня за два часа. 35*2=70 (откр.) - ее подруга за два часа. 60+70=130 (откр.) - таня и подруга вместе за два часа. 300-130=170 (откр.) - осталось. 30*4=120 (откр.) - Таня за четыре часа. 35*4=140 (откр.) - ее подруга за четыре часа. 120+140=260 (откр.) - они вместе за четыре часа. 300-260=40 (откр.) - осталось

Answer 2

Calculation of Remaining Greeting Cards

To calculate the number of greeting cards Tanya and her friend will have left to write after 2 hours and 4 hours of combined work, we can use the given rates of writing cards per hour for each person.

Given: - Tanya writes 30 cards per hour - Tanya's friend writes 35 cards per hour

After 2 Hours

After 2 hours of combined work: - Tanya writes: 30 cards/hour * 2 hours = 60 cards - Friend writes: 35 cards/hour * 2 hours = 70 cards - Total cards written: 60 cards + 70 cards = 130 cards

The total number of cards they need to write is 300, so the remaining cards after 2 hours of combined work will be: 300 cards - 130 cards = 170 cards

After 4 Hours

After 4 hours of combined work: - Tanya writes: 30 cards/hour * 4 hours = 120 cards - Friend writes: 35 cards/hour * 4 hours = 140 cards - Total cards written: 120 cards + 140 cards = 260 cards

The remaining cards after 4 hours of combined work will be: 300 cards - 260 cards = 40 cards

Therefore, after 2 hours of combined work, they will have 170 cards left to write, and after 4 hours, they will have 40 cards left to write.