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arianawelsh123l
12.07.2019 •
Mathematics
Brock is training for a crossfit competition. he began the training completing pull-ups and box jumps origanally, his training plan had him completing and box jumps at a ratio of 5: 4 after two months of his training , he decided to focus on his leg strength and adjusted his ratio 2: 7. if he completed 63 box jumps at the end of his training , how many pull-ups and hos box jumps at the of his training, how many pull-ups did he completed in the initial stage of training
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Ответ:
If the adjusted ratio was 2:7, then
2x is the number of pull-ups
and
7x is the number of box jumps.
You can state that since he completed 63 box jumps at the end of his training, then
7x=63,
x=9
and
2x=18.
The total number of exercises performed is 2x+9x=18+63=81.
As at start the ratio was 5:4, then
5y was the number of pull-ups
and
4y was the number of box jumps.
Therefore, 5y+4y=81,
9y=81,
y=9
and 5y=45, 4y=36.
Initially: 45 pull-ups and 36 box jumps. At the end: 18 pull-ups and 63 box jumps.
Ответ: