Evan has 150 gold coins, 180 silver coins and 420 platinum coins. He wants to place all the coins in stacks so that each stack has the same number of coins. (a) How many stacks of coins can he make? (b) How many coins made of gold, silver and platinum are there in each stack?

A

(a) He can make 5 stacks of coins. (b) Gold: 40 Silver: 50 Platinum: 100

B

(a) He can make 10 stacks of coins. (b) Gold: 50 Silver: 60 Platinum: 120

C

(a) He can make 15 stacks of coins. (b) Gold: 60 Silver: 70 Platinum: 140

D

(a) He can make 20 stacks of coins. (b) Gold: 70 Silver: 80 Platinum: 160

(a) He can make 10 stacks of coins. (b) Gold: 50 Silver: 60 Platinum: 120

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5. A group of students bought tickets to the zoo. A ticket cost \$9. For every 8 students, the 8$^{th}$ one gets a free ticket. If they paid \$171 altogether, what is the minimum possible number of students in the group?

A

21

B

22

C

23

D

24

E

None of the above

Sorry. Please check the correct answer below.

8 students $\longrightarrow$ 9 $\times$ \$7 = 63 2 set of tickets bought $\longrightarrow$ 63 $\times$ 2 = 126 171 $\div$ 126 = 45 45 $\div$ 9 = 5 Maximum number of students $\longrightarrow$ 8 $\times$ 2 + 5 = 16 + 5 = 21

8 students $\longrightarrow$ 9 $\times$ \$7 = 63 2 set of tickets bought $\longrightarrow$ 63 $\times$ 2 = 126 171 $\div$ 126 = 45 45 $\div$ 9 = 5 Maximum number of students $\longrightarrow$ 8 $\times$ 2 + 5 = 16 + 5 = 21

96 apples and 72 oranges are to be repacked into smaller bags. Each bag consists of the same number of apples and oranges. (a) How many bags are there? (b) How many apples and oranges are there in each bag?

A shop sells wire at \$3 per meter. For every 3m of wire bought, 1m is given free. What is the minimum price Isaac has to pay if he wants to buy 26m of wire?

123 exercise books, 205 pencils and 82 erasers are distributed to a class. Each student gets the same number of each item. (a) How many students are there in the class? (b) How many of each item does each student get?

For every muffin Michelle sells, she earns \$2. She receives an additional \$5 for every 8 muffins sold. (a) How much money will Michelle receive if she sells 24 muffins? (b) How much money will she receive if she sells 30 muffins?

For every 8 pineapple tarts that Mrs Lim bakes, Mrs Chan bakes 16. How many pineapple tarts did Mrs Chan bake if they baked 168 pineapple tarts altogether?

Mr Leong washes his car every 7 days. He wipes his bicycle every 3 days. He did both types of cleaning on 2nd January. When will be the next date he has to do both types of cleaning again?

A buffet costs \$22 per person. For every party of 4, the 5$^{th}$ person only pays half the price of the usual price. How much would a party of 22 pay?