Hi there,

1. (Gap & Difference concept)

Before

J |-------------------------|

B |-------------------------|

After

J |-----|<-----------------|

1u 18

B |-------------------|<---|

6u 3

Unit difference = 6u - 1u = 5u

Gap = 18 - 3 = 15

Hence, 5u ----> 15

1u -----> 15 / 5 = 3

J ( at first ) = 1u + 18 ----> 3 + 18 = 21

Hence, each child received $21 allowance last month

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2. (Comparison model)

F |-----|-----|-----| }

K |-----| } 2712

D |-----|-----| }

Hence, 6u ---> 2712

1u ----> 2712 / 6 = 452

F - K = 2u ----> 2 x 452 = 904

Hence, Fred has $904 more than Kivesh

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Cheers,

Edward