PLS answer this ( *not the 2nd question* )
Answers
Step-by-step explanation:
1] the ratio of ages of Sunil and Sumedha =2:3
which can also be taken as
Sunil's age = 2x
Sumedha's age = 3x
after 15 years
Sunil's age = 2x+15
Sumedha's age = 3x+15
Given: after 15years, the ratio of Sunil's and Sumedha's ages are 3:4
i.e
2x+15/3x+15 = 3/4
4(2x+15) = 3(3x+15)
8x+60=9x+45
9x-8x=60-45
x=15
Sunil's age=2×15= 30
Sumedha's age=3×15 = 45
3.] the sum of angles of a triangles = 180
5x+5x+4+5x-4=180
15x=180
x=180/15
x=12
therefore the angles are:
5x=5×12=60
5x+4=5(12)+4=64
5x-4=5(12)-4=56
4.]l=3b
perimeter =2(l+b)
p=2(3b+b)
p=2(4b)
144=8b
b=144/8=18
l=3b=3(18)=54
5.] the age ratio- 1:4
can be taken as x and 4x
after 20 years ages are:
x+20 and 4x+20
given: x+20+4x+20=100
5x=100-40
5x=60
x= 12
4 x = 4 × 12 = 60
6.] first two marks out of 10:
7 & 10
to get 80% aggregate including third test
(7+10+x)/30×100=80%
(17+x)/30=0.8
17+x=24
x=24-17=7