Page 287 - Math Smart - 7

o Lucy got back her results for the following tests:
• 38 out of 50 marks in biology
• 77% in history
• 16 out of 20 marks in mathematics
a) Which subject did Lucy score the highest?
b) What was her percentage score in this subject?
<E) Work out the following values,

a) 50% of 20 m b) 20% of 15 kg c) 15%of120min d) 60% of 1200 kg

In a class of 30 pupils, 60% are girls.
a) What percentage of the pupils are boys?
b) How many of the pupils are boys?
Which is greater, ^ of 49 or 30% of 50?

0) At an international conference, 24 of the 200 women are from Thailand.
What percentage of the women are from Thailand?

Find the following values.
a) 3% of 80 km b) 17% of 200 g c) 65% of 580 /
d) 82% of 360 kg e) 15% of 90 f) 48% of 350

® There are 225 children at a concert. 56% of them are girls. How many boys are there?

© At a party, 260 guests were served either coffee or tea. 35% of them drank coffee.
How many guests drank tea?
The usual price of an oven is 8500 Baht. May bought it at a discount of 8%.
How much did she pay for the oven?

A pack contains 50 seeds and costs $50.
Erica sows all the seeds.
40% of the seeds grow into plants.
She sells the plants for $1 each.
How much profit does she make?

© A tree is 650 cm tall at the start of summer.
The tree grows during summer and its height increases by 8%.

Calculate the increase in the height of the tree.