If ryan and natalie can plant a rosebush in 9.9 minutes and natalie can plant a rose bush in 22 minabout how many min will it take ryan to plant 3 rose bushes?

Question

i would like you showed how to do it than just the answer

Answer 1

Arthur D has the right answer!

Answer 2

x=Ryan's rate

22 minutes=Natalie's rate

in 1 minute Ryan does 1/x of the job and Natalie does 1/22 of the job

together they do the job in 9.9 minutes

(1/x)(9.9)+(1/22)(9.9)=1 (job finished)

multiply both sides by 22x

(22x)(1/x)(9.9)+(22x)(1/22)(9.9)=(22x)(1)

(22)(9.9)+9.9x=22x

217.8+9.9x=22x

217.8=22x-9.9x

217.8=12.1x

2178=121x

x=2178/121

x=18 minutes is Ryan's rate to plant one rosebush

3*18=54 minutes for Ryan to plant 3 rosebushes