Urgent Maths questions..please help!!=)?

Question

1) Benedict spent 2/9 of his pocket money on books, 2/5 of the remainder on magazines and saved the rest.
a) What fraction of his money did Benedict save?
b) If he spent $16 more on the magazines than on the books, how much did he have at first?

2)There were 1800 farm animals consisting of cows, goats and chickens in the ratio 5:6:9. When the farmer bought 297 new farm animals, the number of chickens increased by 20% and the number of goats increased by 10%. What was the new ratio of the three types of animals?

3.Potatoes are kept in 3 sacks, A,B and C. The mass of potatoes in Sack A is 3/5 of the mass of potatoes in Sack B. If the total mass of potatoes is 72kg, what is the mass of potatoes in Sack C?

4. In preparing mixed nuts, Roslan mixes 24g of cashew nuts, 12g of almonds and 44g of peanuts. If he needs to prepare 3kg of mixed nuts, what is the mass of peanuts required?

Thanks!

Answer 1

1)
2/9 buy book
7/9*2/5 = 14/45 buy magazine
a) fraction of money save
= 1 - 2/9 - 14/45
= 7/15
b) If magazine is $16 more
than book
original = x
2/9x+$16=14/45x
4/45x=$16
x =$180

2) cow=x
goat=y
chicken=z
x:y:z=5:6:9
x+y+z = 1800

then x=5/20*1800
= 450
y=6/20*1800
=540
z=9/20*1800
=810

we can get ratio
450:540:810

chicken increase by 20%
z1=810*1.2=972
goat increase by 10%
y1=540*1.1=594

z1-z = 162 ( no increase chicken)
y1-y = 54 (no increasegoat)
So, no increase of cow
= 297-162-54
=81

x1=450+81=531

The new ratio
= x1:y1:z1
= 531:594:972
= 59:66:108

c)
A = 3/5B
A+B+C = 72kg
3/5B+B+C=72
C = 72 - 8/5B

d)
cashew nut=x
almonds=y
peanut=z
x+y+z
=24+12+44
=80g

ratio of peanut to mix nut
= 44/80
= 11/20

For mixed nut 3 kg
mass of peanut
= 3*11/20
= 1.65kg

Answer 2

1 a) 25/45 or 5/9

i don't feel like doing the rest. i'm tired and don't want to do any more.

Answer 3

if x is his pocket money
2x/5 he spend on books.
3x/5 remains
3x/5 *(2/5) = 6x/25 spend on magazines.
Remaining is 3x/5 * 3/5
a) i e 9x/25 saved