Fill in the blanks.
At a gathering,
1720 of the boys and
12 of the girls and
45 of the adults left after 1 hour.
The number of boys, girls, and adults who remained were the same.
- Number of boys at first = _____ u
- Number of girls at first = _____ u
- Number of adults at first = _____ u
- Number of people who remained = _____ u
(a)
Change fraction into units.
Fraction of the boys who remained
= 1 -
1720=
320Fraction of the girls who remained
= 1 -
12 =
12Fraction of the adults who remained
= 1 -
45 =
15The number of boys, girls and adults who remained is the same.
Make the numerators the same.
LCM of 3, 1 and 1 = 3
3 x 120 x 1 of the boys =
1 x 32 x 3 of the girls =
1 x 35 x 3 of the adults
320 of the boys =
36 of the girls =
315 of the adults
Boys : Girls : Adults
20 : 6 : 15
(a)
Number of boys at first = 20 u
(b)
Number of girls at first = 6 u
(c)
Number of adults at first = 15 u
(d)
Number of people who remained
= 3 x 3 u
= 9 u
Answer(s): (a) 20; (b) 6; (c) 15; (d) 9