F.2 MATHS

1. Mr Chan earns $12 000 per month. After spending on rent, he has $8 000 left. Find the percentage of the spending on rent to his monthly salary.

(12000-800) /12000 *100% =33.33%

A. HE PUTS(RENT)"
12000-8000=$4000 (HE PUTS $4000 ON RENT)

B. THE RENT ON HIS INCOME"
$4000 /$12000 = 1/3 (RENT/INCOME)

C. THE PERCENTAGE"
1/3* 100% =33.33%

make the letter in sqare brackets the subject of the formula.
1. PG = KT + C [ T ]
KT+C=PG
KT=PG-C
T =(PG-C) /K

2. S = p + (q - 5)t [ q ]
p+(q-5)t =S
(q-5)t =S-p
q-5 =(S-p)/t
q= [(S-p)/t]+5

3. ap - bq = at [ a ]
-bq=at-ap
-bp=a(t-p)
-bp/(t-p)=a
a=-bq/t-p

4. s(m - 2) = t(m + 1) [ m ]
sm-2s=tm+t
sm-2s-tm=t
sm-tm=t+2s
m(s-t)=t+2s
m=t+2s/s-t

5. V = LWH [ H ]
LWH=V
WH=V/L
H=V/L/W
H=V/LW

6. 3x - 2y +4 = 0 [ x ]
3x=0+2y-4
3x=2y-4
x=(2y-4)/3

no english la****

Percentage of the spending on rent to his monthly salary
= (12 000 – 8 000) / 12 000 * 100%
= 33.33%

make the letter in sqare brackets the subject of the formula.
1. PG = KT + C [ T ]
KT = PG-C
T= (PG-C)/K

2. S = p + (q - 5)t [ q ]
qt = S – p + 5t
q=( S – p + 5t)/t

3. ap - bq = at [ a ]
ap-at=bq
a(p-t)=bq
a=bq/(p-t)

4. s(m - 2) = t(m + 1) [ m ]
sm-2s=tm+t
sm-tm=t+2s
m(s-t)=t+2s
m=(t+2s)/(s-t)

5. V = LWH [ H ]
H=V/LW

6. 3x - 2y +4 = 0 [ x ]
3x=2y-4
x=2(y-2)/3