Problem 15 · 2019 Math Kangaroo
Hard
Fractions, Decimals & Percents
percent-multiplier
Jane plays basketball. Of her first 20 throws, 55% are successful. After five more throws her success rate rises to 56%. How many of her last five throws were successful?
Show answer
Answer: C — 3
Show hints
Hint 1 of 2
Turn each percentage into an actual number of successful throws.
Still stuck? Show hint 2 →
Hint 2 of 2
Subtract to find how many of the last five went in.
Show solution
Approach: convert percents to counts and subtract
- Of the first 20 throws, 55% = 11 were successful.
- After 25 throws the rate is 56%, so 0.56 × 25 = 14 successful in total.
- The last five contributed 14 − 11 = 3 successful throws.
Mark:
· log in to save