The figure below shows two identical right-angled triangles overlapping each other. Find the area of the blue region.
The two triangles are identical,
The yellow region is overlapping and same in area or size.
Therefore, the area of the blue region is equal to the white region.
The area of the blue region = 9 × 6 + ½ × 3 × 6 = 63 cm2
Sarah had some money in the piggy bank. On Monday, she took 2/5 of the money to buy a present. She had $78 left and she put it back into the piggy bank. On Tuesday, she took 3/8 of the money to buy some story books. She had $28.80 left and she put it back into the piggy bank. After that, she found that there was $246.30 in the piggy bank. How much money did she have in the piggy bank at first?
Answer:
Tammy bought some apples and pears. The number of apples to the number of pears is 2:1. An apple cost $1.50 and a pear cost $0.90. Tammy spent $936. How many pears did she buy ?
Answer:
Xavier and Yvonne had a total of 1105 tickets to sell. Xavier sold 3/5 of his tickets and Yvonne sold 3/7 of her tickets. They were left with the same number of tickets. How many tickets did Xavier sell?
Answer:
