Ratios and Rates

Hong Kong

Stage 1 - Stage 3

Consider the ratio $5:8$5:8.

a

If the following ratio is equivalent to $5:8$5:8, find the missing value.

$\editable{}$ : $32$32

b

If the following ratio is also equivalent to $5:8$5:8, find the missing value.

$400$400 : $\editable{}$

Easy

Less than a minute

Kathleen and Luke invest money in a business in the ratio $3:10$3:10.

At a sporting event, the ratio of security personnel to spectators is $1:180$1:180. If $34200$34200 spectators attend the event, how many security personnel will be required?

Two kinds of pine trees, type A and type B, are planted in rows. In each row the ratio of type A to type B is $9:8$9:8. Altogether, $180$180 of type A are planted.

How many of type B are planted?

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