Answer:
20%
Step-by-step explanation:
Answer:
The total saving of Alex (a) and Benjamin (b) was 2000$.
=> a + b = 2000 (1)
Alex donates 1/4 of saving, Benjamin donates 1/5 of saving.
Total donation: 440$
=> (1/4)a + (1/5)b = 440 (2)
From (1) and (2):
=>(1/4)(2000 - b) +(1/5)b = 440
=> 500 - (1/4)b + (1/5)b = 440
=> (1/20)b = 60
=> b = 20 x 60 = 1200$ (current balance of Benjamin)
=> a = 2000 - b = 800$ (current balance of Alex)
Hope this helps!
:)
25%
Explanation: it increased 4$ and 4$ is 25% of 16$
382 - 4 = 378
378/9 = 42
so there are 42 students on each bus
Answer:
22.5 cm, 30 cm, 37.5 cm
Step-by-step explanation:
Sum the parts of the ratio, 3 + 4 + 5 = 12 parts
Divide the perimeter by 12 to find the value of one part of the ratio.
90 cm ÷ 12 = 7.5 cm ← value of 1 part of the ratio, thus
3 parts = 3 × 7.5 cm = 22.5 cm
4 parts = 4 × 7.5 cm = 30 cm
5 parts = 5 × 7.5 cm = 37.5 cm
The 3 sides are 22.5 cm, 30 cm and 37.5 cm
