~ Math: Try These ~

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Try these!


1) The average mass of a group of boys was 48 kg. When John joined the group, the new average mass of the group became 54 kg. If John weighed 72 kg, how many boys were there in the group in the end?



2) There were some rows of chairs in a room. Each row had 5 chairs. When Keith brought in 2 extra chairs and rearranged all the chairs, there were 4 chairs in each row and 3 more rows than before. How many chairs were there at first?



3) Megan, Nora and Olivia shared the cost of a rental flat. Megan paid 2/5 of the total amount paid by Nora and Olivia. The ratio of the amount paid by Nora to the total amount paid by Megan and Olivai was 1 : 3.

a) What is the ratio of the rent paid by Megan to the rent paid by Nora to the rent paid by Olivia?

b) Given that Megan paid $35 more than Nora, how much rent did the 3 girls pay for the flat?