Solve by Comparison and Replacement

5 raisin rolls and 6 donuts cost $14.70.

Each raisin roll costs 3 times as much as each donut.

How much is a raisin roll?

How much is a donut?

5 similar tables and 12 similar chairs cost $720.

Each table costs $25 more than each chair.

What is the cost of a table?

On 1st of March some years ago, one US dollar could be exchanged for 1.45 Singapore dollar. On the same day, 1000 Thai Baht could buy 50 Singapore dollars. How much US dollars could 29 000 Thai Baht buy on that day?

4 footballs and 4 volleyballs cost $240. 3 footballs and 5 volleyballs cost $234.

What is the cost of a volleyball?

What is the cost of a football?

In an ancient village, 10 rabbits can be exchanged for 2 turkeys. 6 turkeys can be exchanged for 2 goats. 10 goats can be exchanged for 2 cows. How many rabbits can 5 cows be exchanged for?

2 peaches and 12 apples cost $14.60. 6 peaches and 4 apples cost $18.20.

How much in an apple?

How much is a peach?

There are 160 white and blue balls, 180 blue and yellow balls, and 170 white and yellow balls. Find the number of each colour of balls.

9 packets of French fries, 2 cheese burgers and 1 cup of soft drink cost $10.95. 1 packet of French fries, 2 cheese burgers and 3 cups of soft drink cost $11.25. Find the price of a set.

3 pieces of item A, 7 pieces of item B and 1 piece of item C in a toy set cost $31.50.

4 pieces of item A, 10 pieces of item B and 1 piece of item C in the same set cost $42.

Find the price of item A + item B + item C.

5 cows and 6 goats feed on 27kg of grass every day. 6 cows and 5 goats feed on 28 kg of grass every day. How many kilograms of grass does a cow feed on each day?

3 basketballs and 5 footballs cost $390. 6 basketballs and 3 footballs cost $465.

What is the cost of a basketball?

What is the cost of a football?

Amanda took 30 minutes to cycle 3000 m and then swim for 1000 m. It took her 48 minutes to cycle 2400 m and swim for 2000 m. How fast could Amanda cycle?

A basket of pears and 2 baskets of oranges weigh 13 kg. 2 baskets ofg apples and 2 baskets of oranges weigh 22 kg. 3 baskets of pears and 2 baskets of apples weigh 21 kg. How much does each basket of fruit weigh?

A rfectangle has a length of 40 cm and a breadth of 20 cm. It is cut into 2 identical squares, 2 identical rectangles and a shaded small square. Find the area of the shaded square.