PSLE
Neave and Fred have the same total number of coins. Neave has a number of ten-cent coins and 44 five-cent coins. The total mass of his coins is 0.806 kg. Fred has a number of ten-cent coins and 104 five-cent coins.

1. Who has less money in coins? How much less? Give your answers in this format. (Eg Adam, $12)
2. Each ten-cent coin is 2.4 g heavier than each five-cent coin. What is the total mass of Fred's coins in kg?

(a)
Both boys have the same number of coins. Since Fred has more five-cent coins than Neave, it means that Fred has less ten-cent coins than Neave.  So Fred has less money.

Difference in the number of five-cent coins.
= 104 - 44
= 60

Difference in the value of 1 five-cent coin and 1 ten-cent coin
= 10 - 5
= 5¢

Amount that Fred had less than Neave
= 60 x 5
= 300¢
= $3

(b)
Difference in the mass between 60 five-cent coins and 60 ten-cent coins
= 60 x 2.4
= 144 g
= 0.144 kg

Total mass of Fred's coins
= 0.806 - 0.144
= 0.662 kg

Answer(s): (a) Neave, $3; (b) 0.662 kg