book Maths Puzzle Numerical Ability

Thirty students bought pennants for the football game.Plain pennants cost $4 each and fancy ones cost $8 each.if the total bill was 168 how many students bought the fancy pennants

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book Other Question

The equations s1=18+0.4m and s2=11.2+0.54m give the lengths of two different springs in centimeters, s1 and s2, as mass amounts in grams, m, are separately added to each.
a. When Anna went to the grocery store. she bough 3 oranges and 6 apples. she paid $4.50. Maria went to the same store and bough 2 oranges and 2 apples. Her cost was $2.10. How much would 1 apple cost?
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