Many thanks. Greatly appreciated

4x + ×/4 = 42.50 X=$10 10 × 3 = $30 Kieran has $30 10 ÷4 = 2.50 10 + 2.50= 12.50 They spend $12.50 altogether

For QN 3 minimum of two $1 notes were used... For the other 11 notes--use assumption method or guess/check

11 notes=$70 All $10=$110 $110-$70=$40 $40/$5= 8 $5notes $30= 3 $10 notes

Answer 3 x $10=-> $30 8 x $5=-->> $40 2 x $1=-->> $2 ------------------------------- Total----->>> $72/- --------------------------------

Err... why take min 2 $1 note eh?

Total is $72...the $2 will come from two $1..

Since the balance is $70 for other notes..the no of $5 notes will be even ...

Thank you... but I need time to digest yah... haha...

Borrow from your parents $72 with $10/$5/$1 notes ...u sure can digest the problem... LOL

Use guess and check method

Total 13 notes . 13 notes minus 2 one dollar notes = 11 notes. Used 11 notes and worked from there. Guess and check method.

For guess and check pls note that the no of $5 notes will be an even no...bcoz of the total sum of $70... And $10 notes will be odd (less than 7 notes )..possibility of $10 notes are 1,3,5, $10note|$5note|$2note|Total| --------------------------------------- 01 || 10. || 2. || $62 || 03. || 08. || 2. || $72. || 05. || 06. || 2. || $82 ||

6

Five 10¢ coins=$0.50 Nine(20¢+50¢ coins)= $3.20-$0.50=$2.70 Guess&Check TotalCoins---20¢---50¢--T-Value ------------------------------------------------- 9. 2. 7. $3.90 9. 4 5. $3.30 9. 6. 3. $2.70 Answer= 6 TwentyCents Coins

Use set square to confirm

(4) 3 pairs (5) 5 pairs (6) 27pairs

7 or 27

27

27?

Can show visual how to get 27??

it would be quite troublesome... need some time

13×2 + 1 ＝ 27

Thank u

Like how Zhong Shu Hao has drawn, most of the parallel lines come from the "plus" shaped figure.

There are 13 pairs of horizontal parallel lines in the "plus" shaped figure. Hence, there will also be 13 pairs of vertical parallel lines. Then, add 1 as there is still the following pair of parallel line.

Thanks both!