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16.04.2020 •
Mathematics
17. a) Ula jest dwa razy młodsza od Oli i o 4 lata starsza od Ali. Razem te trzy
dziewczynki mają 24 lata. Ile lat ma każda z nich?
b) Tata Zosi jest od niej 3 razy starszy, a Zosia jest od niego młodsza o 30 lat.
Ile lat ma Zosia?
c) Julek i Asia są w sumie o 6 lat starsi od Michała, ale każde z nich z osobna
jest od niego młodsze: Julek o 7 lat, Asia o 2 lata. Ile lat mają wszyscy razem?
Daje Naj za odpowiedź daną za godzinę maks
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Ответ:
Part 17)
Ula's age is 7 years
Ola's age is 14 years
Ali's age is 3 years
Part 18) Zosia's age is 15 years
Part 19) All together are 36 years old
Step-by-step explanation:
The question in English is
17. Ula is twice as young as Ola and four years older than Ali. Together these three girls are 24 years old. How old is each of them?
18. Zosia's father is 3 times older than her and Zosia is 30 years younger than him.
How old is Zosia?
19. Julek and Asia are 6 years older than Michael, but each of them separately is younger than him: Julek by 7 years, Asia by 2 years. How old are they all together?
Part 17)
Let
x ----> Ula's age
y ---> Ola's age
z ---> Ali's age
we know that
Ula is twice as young as Ola
Ula is four years older than Ali
Together these three girls are 24 years old.
so
substitute equation A and equation B in equation C
solve for x
Find the value of y
Find the value of z
therefore
Ula's age is 7 years
Ola's age is 14 years
Ali's age is 3 years
Part 18)
Let
x ----> Zosia's father's age
y ----> Zosia's age
we know that
Zosia's father is 3 times older than Zosia.
so
Zosia is 30 years younger than him.
so
substitute equation A in equation B
solve for y
therefore
Zosia's age is 15 years
Part 19)
Let
x ----> Julek's age
y ----> Asia's age
z ----> Michael's age
we know that
Julek and Asia are 6 years older than Michael
so
Julek is 7 years younger than Michael
Asia is 2 years younger than Michael
so
substitute equation B and equation C in equation A
solve for z
Find the value of x
Find the value of y
Adds the ages
therefore
All together are 36 years old
Ответ: