6. A building project takes 12 men 54 days to complete.
(i) How long will it take 9 men to finish the same project?
(ii) Given that the project must be completed in 36 days, find how many men are needed.

7. A shop employs one man and one woman as shop assistants. the man works for 10 hours a day and the woman works for 8 hours per day, and their wages per hour are in the ratio 7:5.If the woman receives $24 per day, find the man's daily wage.

8. To paint a house, John stairs 6 days, Peter takes 4 days, and Paul takes 12 days. How many days will they take if they work together?

give more details

step-by-step explanation:

1. 34

2. 268

3. x=14.4

step-by-step explanation:

your answer is the frist one

hop i

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.