When a question involves 2 or 3 items and you are given the ratio of number of the items is given, we can group the items together into a set and solve the problem using the set.
(Note: A set is simply 2 or more items which are treated as a single unit.)
GrpC1:
John bought an equal number of pens and rulers for $9.80. A pen cost $1 and a ruler cost 40 cents. How much did he spend on the pens?Lucy had a total of $380, consisting of $2 and $5 notes. Given that she had 7 times as many $2 notes as $5 notes, how many notes did she have?
Bala bought 2 more belts than wallets and paid a total of $154. Each belt cost $20 and each wallet cost $18. How many belts did he buy?
A clock and a watch cost $120. Tom paid $840 for 5 clocks and 8 watches. How much does each watch cost?
Wendy sold some apple tarts and vanilla tarts for $153. Each apple tart cost $2 and each vanilla tart cost 5⁄8 as much as the apple tart. 3⁄5 of the tarts sold were apple tarts. How many vanilla tarts did Wendy sell?
Ali spent $92 on an equal number of novels and magazines. Each novel cost $15 and each magazine cost $7 less than each novel. How much more did he spend on the novels than the magazines?
GrpC7:
